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How to make button highlight when hovered over using a template

Recently started WPF and am very new to XAML. I'm trying to make a calculator that looks similar to the IOS one. However, after I changed the Button to Ellipse, the highlighting when hovered over or clicking on stopped working, if also the highlighting issue were to be fixed, how would I go about changing the colour of it?
<Button x:Name="ButtonEquals" Grid.Column="4" Grid.Row="6" Width="47" Height="47"
Content="=" Foreground="White"
BorderBrush="{x:Null}" Background="#FFFF9500">
<Button.Template>
<ControlTemplate TargetType="Button">
<Grid>
<Ellipse Fill="#FFFF9500"/>
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Grid>
</ControlTemplate>
</Button.Template>
</Button>

You can add a Trigger to the ControlTemplate and target the Ellipse by name assigning an x:Name and referring to it via TargetName. This way, you can define other states as well.
<ControlTemplate TargetType="Button">
<Grid>
<Ellipse x:Name="MyEllipse" Fill="#FFFF9500"/>
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsDefaulted" Value="True">
<Setter TargetName="MyEllipse" Property="Fill" Value="OrangeRed"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="MyEllipse" Property="Fill" Value="Blue"/>
</Trigger>
<Trigger Property="IsPressed" Value="True">
<Setter TargetName="MyEllipse" Property="Fill" Value="Red"/>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="MyEllipse" Property="Fill" Value="Gray"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
This targets only the Fill of the Ellipse, without changing other controls in the template. However, the values are hardcoded and not changable from outside.
If you want the template to be customizable to a certain degree, then you can put it in a Style and bind properties on the templated control using TemplateBinding or a RelativeSource with TemplatedParent for two-way and special scenarios. Additionally, you can add a FocusVisualStyle that allows to specify a template for keyboard focusing.
<Style TargetType="Button">
<Setter Property="Background" Value="#FFFF9500"/>
<Setter Property="Foreground" Value="White"/>
<Setter Property="FocusVisualStyle">
<Setter.Value>
<Style>
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate>
<Ellipse StrokeDashArray="1 2" Stroke="DarkGreen" StrokeThickness="2"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid>
<Ellipse x:Name="MyEllipse" Fill="{TemplateBinding Background}"/>
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsDefaulted" Value="True">
<Setter TargetName="MyEllipse" Property="Fill" Value="OrangeRed"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="MyEllipse" Property="Fill" Value="Blue"/>
</Trigger>
<Trigger Property="IsPressed" Value="True">
<Setter TargetName="MyEllipse" Property="Fill" Value="Red"/>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="MyEllipse" Property="Fill" Value="Gray"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
If you want to reuse the style on multiple buttons, add it to a resource dictionary in scope and assign an x:Key to refer to it via StaticResource or DynamicResource.

You need to create Style of button instead Template. Button's template you can set inside style (read more about Style in WPF):
<Button x:Name="ButtonEquals"
Grid.Column="4"
Grid.Row="6"
Width="47"
Height="47"
Content="=">
<Button.Style>
<Style TargetType="Button">
<!-- Here is properties for buttons with same style-->
<Setter Property="Foreground" Value="White"/>
<Setter Property="BorderBrush" Value="{x:Null}"/>
<Setter Property="Background" Value="#FFFF9500"/>
<!-- Here is your template -->
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid>
<Ellipse Fill="{TemplateBinding Background}"/>
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
<!-- Here is style triggers for interact with button -->
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<!-- Set color as you wish -->
<Setter Property="Background" Value="LightSalmon"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
But actually, you need to create global ResourceDictionary (read about it) and there set styles for all buttons like <Style x:Key="CalculatorButton"> for set to buttons like <Button Content="1" Style="{StaticResource CalculatorButton}"/>

Change property of controls child object by using Styles or DataTemplate in WPF application

Let's say I have a button and I have an image (though it could be any controls) inside of it:
<Button Width="150" Height="80">
<Image Source="..." Width="50" Height="50" />
</Button>
I want to change the style of button when mouse is over it and make it so that I could also change properties of the image inside when it happens.
<Style TargetType="Button">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Opacity" Value="0.5" />
<!-- Here I want to change alignment of the image inside the button if there is one -->
<Setter Property="Image.HorizontalAlignment" Value="Right" />
</Trigger>
</Style.Triggers>
</Style>
But it doesn't work this way, and for some reason any child controls start to change alignment, not only images but also text and other controls. The other things I tried just didn't compile. Probably DataTemplate should be used; I'm new to WPF and XAML and I still don't understand it enough and couldn't find what I need yet.

You should use HorizontalContentAlignment to set the content alignment of a button:
<Setter Property="HorizontalContentAlignment" Value="Right" />
Based on your comment below, I can give an example:
<Button Grid.Row="2" Width="150" Height="80">
<DockPanel Height="80" Width="150"><!-- A more complex control here-->
<Image Width="50" Height="50">
<Image.Source>
<BitmapImage DecodePixelWidth="50" UriSource="https://www.gravatar.com/avatar/9eae4ae63d70142e81f0365de42474ae?s=32&d=identicon&r=PG&f=1" />
</Image.Source>
</Image>
</DockPanel>
<Button.Style>
<Style TargetType="Button">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Opacity" Value="0.5" />
</Trigger>
</Style.Triggers>
<Style.Resources>
<Style TargetType="Image"><!-- The style target to the image control only in the button control -->
<Style.Triggers>
<!-- Binding to IsMouseOver of the button-->
<DataTrigger Binding="{Binding IsMouseOver, RelativeSource={RelativeSource AncestorType={x:Type Button}}}" Value="True">
<Setter Property="HorizontalAlignment" Value="Right" />
</DataTrigger>
</Style.Triggers>
</Style>
</Style.Resources>
</Style>
</Button.Style>
</Button>

Customising ToggleButton state images using XAML

I am currently using the XAML below to change the image on a toggle button for each state. How can I define a template or style that will allow me to define the images that are to be used in the button definition such that I don't have to repeat everything below for each button. Is this even possible ?
Ideally I would like to define a template with properties such as 'checkedImage', 'uncheckedImage' and then set these properties in the button definition in Designer.
I would also like the button to prevent the display of any other states or animations but I can't seem to prevent the background changing when the button is selected or when there is a mouseover. Are there some additional states that I don't have defined below?
Sample code (XAML, C#) for the style or template and for the actual toggle button definition would be appreciated. Also any references to 'simple' samples and explanations would be appreciated.
Thanks
EDIT: Update with my latest attempt...
This almost works - the correct image never gets displayed when the button is Checked. Any ideas what I am missing here?
<Style x:Key="ImgToggleButton" TargetType="ToggleButton">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ToggleButton">
<Grid x:Name="GD" Background="White">
<ContentPresenter x:Name="CP" Content="{TemplateBinding Content}"></ContentPresenter>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter Property="Content">
<Setter.Value>
<Image Source="{Binding Path=Tag, RelativeSource={RelativeSource AncestorType=ToggleButton}}" Stretch="Uniform"/>
</Setter.Value>
</Setter>
<Setter TargetName="GD" Property="Background" Value="{DynamicResource ThemeSolidColorBrushBlue}"/>
</Trigger>
<Trigger Property="IsChecked" Value="False">
<Setter TargetName="GD" Property="Background" Value="White"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="True">
<!-- Nothing so we have no change-->
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
And here is the button definition
<ToggleButton x:Name="allTestsToggleButton" Tag="Asset/AllTestsButton_1.png" Style="{DynamicResource ImgToggleButton}" ClickMode="Press" Checked="allTestsToggleButton_Checked" Unchecked="allTestsToggleButton_Unchecked" Grid.Row="2" Grid.Column="3" Grid.ColumnSpan="5">
<ToggleButton.Content>
<Image Source="Assets/AllTestsButton_0.png" Stretch="Uniform"/>
</ToggleButton.Content>
</ToggleButton>
Setting TargetName="CP" does not work either
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter TargetName="CP" Property="Content">
<Setter.Value>
<Image Source="{Binding Path=Tag, RelativeSource={RelativeSource AncestorType=ToggleButton}}" Stretch="Uniform"/>
</Setter.Value>
</Setter>
<Setter TargetName="GD" Property="Background" Value="{DynamicResource ThemeSolidColorBrushBlue}"/>
</Trigger>
<Trigger Property="IsChecked" Value="False">
<Setter TargetName="GD" Property="Background" Value="White"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="True">
<!-- Nothing so we have no change-->
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>

Update1
You can use this style for multiple button with different images and I have used tag for storing image for checked state true and use templatebinding for default look i.e state=false
<Window.Resources>
<BitmapImage x:Key="imag1" UriSource="image1.jpg"></BitmapImage>
<BitmapImage x:Key="imag2" UriSource="path.jpg"></BitmapImage>
<Style TargetType="ToggleButton">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ToggleButton">
<Grid x:Name="GD" Background="{TemplateBinding Background}">
<ContentPresenter></ContentPresenter>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter TargetName="GD" Property="Background">
<Setter.Value>
<ImageBrush ImageSource="{Binding Path=Tag, RelativeSource={RelativeSource AncestorType=ToggleButton}}"></ImageBrush>
</Setter.Value>
</Setter>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<ToggleButton x:Name="sampleTestToggleButton" Tag="{StaticResource imag2}" ClickMode="Press" Grid.Row="4" Grid.Column="3" BorderBrush="Transparent" Foreground="Transparent">
<ToggleButton.Background>
<ImageBrush ImageSource="{StaticResource imag1}"></ImageBrush>
</ToggleButton.Background>
</ToggleButton>
Update2:
Hope this helps.Run this code separately.It is working fine here.
<Window.Resources>
<Style x:Key="ImgToggleButton" TargetType="ToggleButton">
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate>
<Image Stretch="Uniform" Source="{Binding Content,RelativeSource={RelativeSource TemplatedParent}}"></Image>
</DataTemplate>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ToggleButton">
<Grid x:Name="GD" Background="White">
<ContentPresenter></ContentPresenter>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate>
<Image Stretch="Uniform" Source="{Binding Path=Tag, RelativeSource={RelativeSource AncestorType=ToggleButton}}"></Image>
</DataTemplate>
</Setter.Value>
</Setter>
</Trigger>
<Trigger Property="IsChecked" Value="False">
<Setter TargetName="GD" Property="Background" Value="White"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="True">
<!-- Nothing so we have no change-->
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<ToggleButton x:Name="allTestsToggleButton" Content="imag2.jpg" Tag="imag1.jpg" Style="{DynamicResource ImgToggleButton}" ClickMode="Press" Grid.Row="2" Grid.Column="3" Grid.ColumnSpan="5"/>

I think, you need for the ability to use vector graphics in WPF. In this case, to use the Path, where in Data to the specified coordinates on which the object is drawn MSDN.
Advantages:
Do not store it in the files, smaller size
Do not store this files in Resources
Dynamically changing color, size and the whole shape
The Minuses, in my opinion:
You can not always find the right Data for the Path
About minus: There are special sites, like www.modernuiicons.com and utilities for converting the image to Data. For converting Image to Vector graphics (Path) use Inkscape, him free and very useful. For more information see this link:
Vectorize Bitmaps to XAML using Potrace and Inkscape
Example
<Window.Resources>
<Style x:Key="styleCustomCheckBox" TargetType="{x:Type CheckBox}">
<Setter Property="FontFamily" Value="Verdana" />
<Setter Property="FontSize" Value="14" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type CheckBox}">
<StackPanel Orientation="Horizontal">
<Path x:Name="MyPin" Width="18" Height="18" Stretch="Fill" Fill="#FF000000"
Data="F1 M 56.1355,32.5475L 43.4466,19.8526C 42.7886,20.4988 42.298,21.2123 41.9749,21.9932C 41.6519,22.7741 41.4903,23.5729 41.4903,24.3895C 41.4903,25.1942 41.6529,25.987 41.9779,26.7679L 34.0577,34.6821C 33.3918,34.3372 32.6991,34.0776 31.9796,33.9032C 31.2601,33.7288 30.5298,33.6415 29.7885,33.6415C 28.623,33.6415 27.4953,33.8526 26.4052,34.2748C 25.315,34.697 24.3419,35.3342 23.4856,36.1865L 30.2344,42.9174L 25.9027,47.9032L 22.6532,51.8425L 20.5988,54.5836C 20.1212,55.2892 19.8823,55.753 19.8823,55.975L 19.8645,56.0701L 19.9002,56.088L 19.9002,56.1474L 19.9358,56.1058L 20.0131,56.1236C 20.2351,56.1236 20.6989,55.8888 21.4045,55.419L 24.1457,53.3765L 28.0849,50.1151L 33.0945,45.7775L 39.8016,52.5025C 40.6579,51.6462 41.2961,50.6731 41.7163,49.5829C 42.1365,48.4928 42.3466,47.367 42.3466,46.2056C 42.3466,45.4603 42.2603,44.729 42.0879,44.0115C 41.9155,43.294 41.6548,42.6003 41.3069,41.9304L 49.2202,34.0161C 50.0011,34.3372 50.7939,34.4978 51.5986,34.4978C 52.4192,34.4978 53.2189,34.3362 53.9979,34.0132C 54.7768,33.6901 55.4894,33.2015 56.1355,32.5475 Z "/>
<ContentPresenter VerticalAlignment="Center" Margin="10,0,0,0" />
</StackPanel>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="False">
<Setter TargetName="MyPin" Property="Data" Value="F1 M 32.3691,30.2225L 33.2253,29.3901L 15.361,11.5258C 13.9814,12.7067 12.6951,13.9936 11.5148,15.3738L 26.6252,30.4842C 27.743,30.1631 28.8767,30.0025 30.0263,30.0025C 30.8191,30.0025 31.6,30.0759 32.3691,30.2225 Z M 45.5039,49.3629L 60.6292,64.4826C 62.0123,63.2996 63.3017,62.0101 64.4846,60.6268L 46.6218,42.7866L 45.7834,43.619L 45.9439,44.7726L 45.9915,45.9261L 45.8785,47.6713L 45.5039,49.3629 Z M 56.1355,32.5475L 43.4466,19.8526C 42.7886,20.4987 42.298,21.2123 41.9749,21.9932C 41.6519,22.7741 41.4903,23.5729 41.4903,24.3895C 41.4903,25.1942 41.6529,25.987 41.9779,26.7679L 34.0577,34.6821C 33.3918,34.3372 32.6991,34.0776 31.9796,33.9032C 31.2601,33.7288 30.5298,33.6415 29.7885,33.6415C 28.623,33.6415 27.4953,33.8526 26.4052,34.2748C 25.315,34.697 24.3419,35.3342 23.4856,36.1865L 30.2344,42.9174L 25.9027,47.9032L 22.6532,51.8425L 20.5988,54.5836C 20.1212,55.2892 19.8823,55.753 19.8823,55.975L 19.8645,56.0701L 19.9002,56.0879L 19.9002,56.1474L 19.9358,56.1058L 20.0131,56.1236C 20.2351,56.1236 20.6989,55.8888 21.4045,55.419L 24.1457,53.3765L 28.0849,50.1151L 33.0945,45.7775L 39.8016,52.5025C 40.6579,51.6462 41.2961,50.6731 41.7163,49.5829C 42.1365,48.4928 42.3466,47.367 42.3466,46.2056C 42.3466,45.4603 42.2603,44.729 42.0879,44.0115C 41.9155,43.294 41.6548,42.6003 41.306,41.9304L 49.2202,34.0161C 50.0011,34.3372 50.7939,34.4978 51.5986,34.4978C 52.4192,34.4978 53.219,34.3362 53.9979,34.0132C 54.7768,33.6901 55.4894,33.2015 56.1355,32.5475 Z " />
<Setter TargetName="MyPin" Property="Fill" Value="Gray" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<StackPanel Orientation="Vertical" HorizontalAlignment="Center">
<CheckBox Height="35"
Style="{StaticResource styleCustomCheckBox}"
Content="MySolution1" />
<CheckBox Height="35"
Style="{StaticResource styleCustomCheckBox}"
Content="MySolution2" />
</StackPanel>
Output

Image Source Xaml

I try to make a button image change when it is Pressed, Normal and Disabled, this is my XAML code:
<Button x:Name="Open" Content="Open" HorizontalAlignment="Right" Margin="442,0,0,0" VerticalAlignment="Top" Width="75" Height="20" Click="Open_Click" IsDefault="False" IsEnabled="True">
<Button.Template>
<ControlTemplate TargetType="{x:Type Button}">
<Grid>
<Image x:Name="Normal" Source="../Resources/o_b.png" Visibility="Visible"/>
<Image x:Name="Pressed" Source="../Resources/o_b.png" Visibility="Hidden"/>
<Image x:Name="Disabled" Source="../Resources/o_b.png" Visibility="Hidden"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsPressed" Value="True">
<Setter TargetName="Normal" Property="Visibility" Value="Hidden"/>
<Setter TargetName="Pressed" Property="Visibility" Value="Visible"/>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="Normal" Property="Visibility" Value="Hidden"/>
<Setter TargetName="Disabled" Property="Visibility" Value="Visible"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Button.Template>
</Button>
And this is the error i have,
"Could not find a part of the path 'D:\vs saves\QuickImg\Resources\o_b.png'.
I get this same error at all lines where i try to access the image resources.
UPDATE: I solved the problem, I ain't sure what caused this problem but i just deleted the Resources folder and created a new one named Images, added the images and updated the Source in the xaml.

The problem was that I probably did not set o_b.png as resource.

Creating a WPF Button that dynamically changes its content

I have created a custom WPF button that has 3 states (normal, clicked, disabled). For each state I have a different image. I use this general button in different places in my project and each time I load a different images using a property in the .CS file.
<Button.Resources>
<ImageSource x:Key="Normal">..\Resources\DefaultNormal.png</ImageSource>
<ImageSource x:Key="Disabled">..\Resources\DefaultDisabled.png</ImageSource>
<ImageSource x:Key="Pressed">..\Resources\DefaultPressed.png</ImageSource>
</Button.Resources>
<Button.Template>
<ControlTemplate TargetType="{x:Type Button}">
<Grid>
<Image Name="normal" Source="{DynamicResource Normal}" Stretch="Fill"/>
<Image Name="pressed" Source="{DynamicResource Pressed}" Stretch="Fill" Visibility="Hidden"/>
<Image Name="disabled" Source="{DynamicResource Disabled}" Stretch="Fill" Visibility="Hidden"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsPressed" Value="True">
<Setter TargetName="normal" Property="Visibility" Value="Hidden"/>
<Setter TargetName="pressed" Property="Visibility" Value="Visible"/>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="normal" Property="Visibility" Value="Hidden"/>
<Setter TargetName="disabled" Property="Visibility" Value="Visible"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Button.Template>
Now I would like to do the same with the button's text/content but I can't find something similar to ImageSource for text. Is there something like that?, or is there a different way to change the text dynamically?

It looks like you just need to add a new element to your control template; then you can access it in the triggers.
<ControlTemplate TargetType="{x:Type Button}">
<Grid>
<Image Name="normal" Source="{DynamicResource Normal}" Stretch="Fill"/>
<Image Name="pressed" Source="{DynamicResource Pressed}" Stretch="Fill" Visibility="Hidden"/>
<Image Name="disabled" Source="{DynamicResource Disabled}" Stretch="Fill" Visibility="Hidden"/>
<TextBlock Name="text" Text="{TemplateBinding Content}" VerticalAlignment="Center" HorizontalAlignment="Center" />
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsPressed" Value="True">
<Setter TargetName="normal" Property="Visibility" Value="Hidden"/>
<Setter TargetName="pressed" Property="Visibility" Value="Visible"/>
<Setter TargetName="text" Property="Text" Value="Pressed :)"/>
</Trigger>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="normal" Property="Visibility" Value="Hidden"/>
<Setter TargetName="disabled" Property="Visibility" Value="Visible"/>
<Setter TargetName="text" Property="Text" Value="Disabled :("/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
Here I added a TextBlock over the images, and changed the text on press/disabled states.
If you wanted to add the text strings as resources within the control, then use the System namespace to reference the String type. xmlns:clr="clr-namespace:System;assembly=mscorlib
<Button.Resources>
<clr:String x:Key="NormalText">Normal</clr:String>
<clr:String x:Key="DisabledText">Disabled</clr:String>
<clr:String x:Key="PressedText">Pressed</clr:String>
</Button.Resources>

Try this:
1) Add to namespace:
xmlns:system="clr-namespace:System;assembly=mscorlib"
2) Add to resource this entry:
<system:String x:Key="myMessage">Button state: clicked!</system:String>
And now you can use in TextBlock Text property "myMessage" or as Button content:
<Button Content="{StaticResource myMessage}" />