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Content of a Button Style appears only in one Button instance

I have a Viewbox:
<Viewbox x:Key="SampleViewbox" >
<Grid>
<Ellipse Stroke="#e2e2e0" StrokeThickness="6" Fill="#d5273e" Width="128" Height="128"/>
</Grid>
</Viewbox>
I then include this in a Style like:
<Style x:Key="SampleStyle" TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="Transparent" >
<ContentPresenter Content="{StaticResource SampleViewbox}"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Now I created many buttons with SampleStyle
<Grid>
<StackPanel>
<Button Style="{StaticResource SampleStyle}" Height="50" Width="50"></Button>
<Button Style="{StaticResource SampleStyle}" Height="80" Width="80"></Button>
<Button Style="{StaticResource SampleStyle}" Height="20" Width="20"></Button>
</StackPanel>
</Grid>
However, Only one button has the Ellipse (viewbox)
How can I make all the buttons have/show the ellipse??

Viewbox is FrameworkElement which cannot belong to multiple parents. Every time buttons request a resource {StaticResource SampleViewbox} they get the same instance.
to change that behavior add x:Shared="False" attribute
<Viewbox x:Key="SampleViewbox" x:Shared="False">

I think a good approach is to use DataTemplate.
So you will have
<DataTemplate x:Key="SampleViewbox">
<Viewbox>
<Grid>
<Ellipse
Width="128"
Height="128"
Fill="#d5273e"
Stroke="#e2e2e0"
StrokeThickness="6" />
</Grid>
</Viewbox>
</DataTemplate>
And for style
<Style x:Key="SampleStyle" TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="Transparent">
<ContentPresenter ContentTemplate="{StaticResource SampleViewbox}" />
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>

Setting the x:Shared attribute of the ViewBox to false as suggested by #ASh will indeed work but why don't you just include the ViewBox in the ControlTemplate like this?
<Style x:Key="SampleStyle" TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="Transparent" >
<Viewbox>
<Grid>
<Ellipse Stroke="#e2e2e0" StrokeThickness="6" Fill="#d5273e" Width="128" Height="128"/>
</Grid>
</Viewbox>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
A template is a template and a control instance is an instance.

WPF TabItem HeaderTemplate style applying inconsistently

I am getting some strange behavior when I follow the steps provided by other SO answers to how to style tab item headers.
With
<Style TargetType="{x:Type TabItem}">
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate DataType="{x:Type TabItem}">
<buttons:MyButtonControl Content="{TemplateBinding Content}" />
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
And a tab control as follows
<TabControl>
<TabItem Header="Buttons">
<local:Buttons />
</TabItem>
<TabItem Header="Labels">
<local:Labels />
</TabItem>
</TabControl>
I get a tab control that looks like this
How do I get the style to apply to all tab headers? How do I remove the default tab header style around my datatemplate?
EDIT
If I style the Template rather than the header template the content stops showing up but at least the border goes away on the header that works.
<Style TargetType="{x:Type TabItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TabItem}">
<buttons:MyButtonControl Content="{TemplateBinding Content}" />
</DataTemplate>
</Setter.Value>
</Setter>
</Style>

The missing part appears to have been a ContentPresenter with the ContentSource property set to Header.
(Also using a button in the header prevents the tab from being clicked on because the button eats the click event.)
This code displays correctly.
<Style TargetType="TabItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TabItem}">
<Border>
<ContentPresenter ContentSource="Header">
<ContentPresenter.ContentTemplate>
<DataTemplate>
<TextBlock Text="{TemplateBinding Content}" />
</DataTemplate>
</ContentPresenter.ContentTemplate>
</ContentPresenter>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>

WPF Combobox style will not change when DisplayMemberPath is set

So i've looked around but have been unable to find an answer to this issue. I am trying to style a combobox that has DisplayMemberPath. As long as that field is set the fontsize that I set has no effect on the combobox. I've also tried applying template styles, but the results are the same for the font. The question/answer listed in question "ComboBox Style problems with DisplayMemberPath" doesn't address fontsize but appears to be more geared to resulting colors.
Here is the combobox:
<ComboBox
Grid.Row="0"
Height="36"
VerticalAlignment="Center"
ItemsSource="{Binding VideoDeviceFilters}"
SelectedValue="{Binding VideoDeviceFilter}"
DisplayMemberPath="Name"
Margin="0,11.857,1.333,11.856"
Grid.Column="1"
TextBlock.FontSize="18.333"/>
And here is the combobox without the displaymemberpath:
<ComboBox Grid.Row="1"
Height="35"
VerticalAlignment="Center"
Margin="0,12.857,1.333,11.856"
ItemsSource="{Binding InstalledPrinters}"
SelectedValue="{Binding Printer}"
Grid.Column="1"
TextBlock.FontSize="18.333"/>
Here is also the style declared in the view:
<UserControl.Resources>
<Style TargetType="{x:Type ComboBoxItem}">
<Setter Property="SnapsToDevicePixels" Value="True" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ComboBoxItem">
<Border x:Name="ItemBorder" Padding="2,0" BorderThickness="1" CornerRadius="3" TextBlock.FontSize="18.333" >
<ContentPresenter />
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>
Please let me know if you need any more information.
And here is the result:
The Result

WPF: Styling ContentControl

I would like to create a style that could be applied to any ContentControl which would take the ToolTip and add an image to the ContentControl and apply the tool tip text from the object to the image. I have about a hundred of these that need to be done (in various projects) so being able to create a style would save a lot of typing.
What I am trying to recreate is this (ToolTip text is on the blue 'i' and not the 'Reload Employee Data':
which is accomplished via the following:
<StackPanel Orientation="Horizontal">
<CheckBox Content="Reload Employee Data"
IsChecked="{Binding AdjustmentSettings.ReloadEmployeeData}"
Grid.Row="0"
Grid.Column="0">
</CheckBox>
<Image Source="/DelphiaLibrary;Component/Resources/info.ico"
ToolTip="Check if you want to re-upload ..."/>
</StackPanel>
What I am trying to avoid is creating a new stack panel each time I want to add the blue 'i' with the tool tip text on the 'i' and not on the text of the object.
I was able to create the following that works for a Label:
<!-- Works for just Label -->
<Style x:Key="LabelToolTipStyle"
TargetType="{x:Type Label}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Label">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{TemplateBinding Content}" />
<Image Source="info.ico" ToolTip="{TemplateBinding ToolTip}"/>
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
And I can call this simply by adding the style to the label like so:
<Label Content="First Text" Style="{StaticResource LabelToolTipStyle}" ToolTip="Label with LabelToolTipStyle" />
I then tried to make this more generalized by creating a style targeting ContentControl but obviously doesn't work because this overrides the entire template (in the case of CheckBox control, the checkbox is missing):
<!-- Works on Label but not CheckBox -->
<Style x:Key="ContentToolTipStyle"
TargetType="{x:Type ContentControl}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ContentControl">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{TemplateBinding Content}" />
<Image Source="info.ico" ToolTip="{TemplateBinding ToolTip}"/>
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Is there a way that I could create a style for ContentControls that would allow me to ADD to the template without redefining the entire template? If it cannot be done to ContentControl I wouldn't be opposed to creating a separate style for each control type but would like to avoid redefining the entire template to do so.

You are almost there. You need to create a custom control template for a ContentControl:
<Style x:Key="ToolTipWrapper" TargetType="{x:Type ContentControl}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ContentControl}">
<StackPanel Orientation="Horizontal">
<StackPanel.ToolTip>
<ToolTip Visibility="Hidden" />
</StackPanel.ToolTip>
<ContentPresenter />
<Image Source="info.ico" ToolTip="{TemplateBinding ToolTip}" />
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Then wrap your elements in a ContentControl and apply the style:
<ContentControl Style="{StaticResource ToolTipWrapper}" ToolTip="Hello world">
<CheckBox Content="I am a check box" />
</ContentControl>
What you can't do is to automatically apply the custom style to all "content" controls: you will always need the extra ContentControl wrapped around each element you want to style in this way.

TabControl item header text appears blurry after rotating tabs

I have a requirement to create a WPF TabControl control with tabs rotated to the left.
The resources I've found online suggest that this can be done by applying the following two things to the TabControl:
<Setter Property="LayoutTransform">
<Setter.Value>
<RotateTransform Angle="270"/>
</Setter.Value>
</Setter>
and
<TabControl TabStripPlacement="Left" ...
All this works and the tabs are displayed as required but for some reason the Header text in the tabs appears blurry after the rotation, please suggest why this is happening and if there is anything I can do to fix this issue.
Complete XAML:
<Window x:Class="WpfApplication2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<TabControl BorderBrush="Gray" BorderThickness="1" TabStripPlacement="Left">
<TabControl.ItemContainerStyle>
<Style TargetType="{x:Type TabItem}">
<Setter Property="LayoutTransform">
<Setter.Value>
<RotateTransform Angle="270"/>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TabItem}">
<Grid>
<Border Name="Border" BorderBrush="Gray" BorderThickness="1" CornerRadius="6,6,0,0">
<ContentPresenter x:Name="ContentSite"
VerticalAlignment="Center" HorizontalAlignment="Center"
ContentSource="Header" Margin="12,2,12,2"/>
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</TabControl.ItemContainerStyle>
<TabItem Header="Item 1" />
<TabItem Header="Item 2" />
<TabItem Header="Item 3" />
</TabControl>
</Grid>
</Window>

Add the following properties to the window declaration XAML
TextOptions.TextFormattingMode="Display"
TextOptions.TextRenderingMode="ClearType"
UseLayoutRounding="true"

You could check out the RenderOptions class which controls rendering behavior of Objects. For example see this (Image in WPF getting Blurry) where it was used to reduce blurring of images.

Try to add SnapsToDevicePixels="True" and UseLayoutRounding="True" to your Border or TabControl tag. These have solved my blurriness problems in most cases.
I suggest this code snippet :
<TabControl TabStripPlacement="Left" Margin="5" FontSize="13" FontFamily="Verdana" Grid.ColumnSpan="2" SnapsToDevicePixels="True" UseLayoutRounding="True" >
<TabControl.Resources>
<Style TargetType="{x:Type TabItem}">
<Setter Property="BorderThickness" Value="0"/>
<Setter Property="Padding" Value="0" />
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate>
<Border x:Name="grid" Margin="0" >
<Border.LayoutTransform>
<RotateTransform Angle="270" ></RotateTransform>
</Border.LayoutTransform>
<ContentPresenter>
<ContentPresenter.Content>
<TextBlock FontFamily="Verdana" Margin="4" Text="{TemplateBinding Content}">
</TextBlock>
</ContentPresenter.Content>
</ContentPresenter>
</Border>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
</TabControl.Resources>
<TabItem Name="General" Header="YourHeader" > ..