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Changing Button style's alternative like Bold button in Microsoft word in wpf

my question is that
is there any way for implementation a button like bold Button in word when click its background will be change , ""with out get boolean var"" ,
that means I want to know is there ant event or trigger or visualstate in xaml order to implement a button style when click its style will be change(during Working like word) and its style will come back to Normal style when click again ?
image Bold Btn

The way to do this is with style triggers. Like so...
<ToggleButton Content="B" FontSize="20" Height="40" Width="40">
<ToggleButton.Style>
<Style TargetType="{x:Type ToggleButton}">
<Style.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter Property="FontWeight" Value="ExtraBold"/>
</Trigger>
</Style.Triggers>
</Style>
</ToggleButton.Style>
</ToggleButton>

WPF: Style.Setter Changes ComboBox Colors, Won't Change Back

I've got a ComboBox I'm hiding and showing with a Style.Setter on the Visibility property:
<ComboBox ItemsSource="{Binding ElementName=BVTWindow, Path=DataContext.AreaList}" SelectedItem="{Binding Path=Area}">
<ComboBox.Style>
<Style TargetType="{x:Type ComboBox}">
<Style.Setters>
<Setter Property="Visibility" Value="Collapsed" />
</Style.Setters>
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=BVTWindow, Path=DataContext.IdentitySelection}" Value="Test Management">
<Setter Property="Visibility" Value="Visible" />
</DataTrigger>
</Style.Triggers>
</Style>
</ComboBox.Style>
</ComboBox>
This works great. Unfortunately, applying the style setter (for some reason) removes the color theme from the ComboBox. Now it's a light grey box with white text and nearly unreadable.
I tried adding Foreground and Background attributes to the ComboBox tag, but it had no effect.
I also tried adding Setter Properties for Foreground and Background to the DataTrigger, also with no effect.
I need to either stop the theme from being removed from the box, manually set the text color, or manually set the background color.
I read one article saying that Windows 8 (which is what I'm using) interferes with ComboBox styling, but there wasn't an easily-understandable solution for it.
Any advice would help me out a lot. Thanks in advance.

This articles explains it pretty well:
http://social.technet.microsoft.com/wiki/contents/articles/24240.changing-the-background-color-of-a-combobox-in-wpf-on-windows-8.aspx
Basically, Windows 8 has a different setup for ComboBox, and it breaks some of the style attributes. You can still style it, but you've got to right click the ComboBox and pick "edit template". This will generate a massive amount of xaml in your project view (color schemes for every possible combination of states), but you probably don't need all of it. I played with commenting / uncommenting sections to figure out what each Trigger and Setter affected, then set my colors and killed the extra parts.

I have a new solution that's much cleaner, faster, easier and better-looking than my previous idea:
Just wrap the ComboBox in a WrapPanel or StackPanel and apply the Style Setter to the parent. The control will retain it's proper style and the parent panel should be transparent anyway, so styles won't matter there. Worst case, you've got a WrapPanel with only one item in it and two extra lines of code in the xaml. This will work with other controls as well, as I just had to do it with a Checkbox.
Here's an example:
<WrapPanel>
<WrapPanel.Style>
<Style TargetType="{x:Type WrapPanel}">
<Setter Property="Visibility" Value="Collapsed"/>
<Style.Triggers>
<DataTrigger Binding="{Binding DataContext.TesterIdentitySelection.CanEdit, ElementName=BVTWindow}" Value="true">
<Setter Property="Visibility" Value="Visible"/>
</DataTrigger>
</Style.Triggers>
</Style>
</WrapPanel.Style>
<ComboBox ItemsSource="{Binding Path=DataContext.AreaList, ElementName=BVTWindow}" DisplayMemberPath="Name" SelectedItem="{Binding Path=Area, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" ToolTip="Select the testing area."/>
</WrapPanel>
The combo box is inside the wrap panel, and the wrap panel is what has the show/hide behavior applied to it. Since the wrap panel doesn't really have any style itself (just an invisible holder), everything ends up looking great.

Change foreground color of ComboBoxItem when ComboBox is hovered

At the moment, I'm styling WPF controls. This is how my custom <Button> looks hovered.
And this is how <ComboBox> looks when mouse is over it.
Simply, I want to be able to change foreground color of currently selected ComboBoxItem when whole ComboBox is hovered. In this example, I'd like to have similiar yellow color like on <Button> control.
The problem is, that <ComboBox> has different ControlTemplates for ComboBox item and toggle button. I don't know how to interact between those two.
The template for <ComboBox> is pretty big, so I'm not going to post it here. Also, you don't have to post full answer if it's not required to explain the problem.

OK, I found a solution. You need to edit default ComboBox templates.
In Visual Studio 2013 you can get a default template in Designer by clicking right mouse button on ComboBox -> Edit template -> Edit a copy...
In <ControlTemplate x:Key="ComboBoxTemplate" TargetType="{x:Type ComboBox}"> you have to add a following trigger:
<ControlTemplate.Triggers>
...
<Trigger Property="IsMouseOver" TargetName="toggleButton" Value="true">
<Setter Property="TextElement.Foreground" TargetName="contentPresenter" Value="Yellow" />
</Trigger>
...
</ControlTemplate.Triggers>
Also, apply a style to ComboBoxItem:
<Style TargetType="{x:Type ComboBoxItem}">
<Setter Property="Foreground" Value="Black"/>
</Style>
Now, it works like a charm.

Deriving (Expanding) a Control Template in WPF

I have this DataGrid I want to change the Disabled behaviour (xaml);
I want to change this small part in the template.
If it is not possible i dont mind to use:
<Setter Property="OverridesDefaultStyle" Value="True"/>
And To replace the entire xaml (template) of my control, But I need the complete template to copy paste and help where to change the Disabled look-like part.
Can anyone help me?

EDIT: It's been pointed out that all the default control templates are available at MSDN which makes the below relevant, but I'll leave it here for interest.
Given an instance of a control you get serialize the markup for the control template using the System.Windows.Markup.XamlWriter class.
To get a control template:
string markup = System.Windows.Markup.XamlWriter.Save(control.Template);
To get a complete dump (including triggers etc) of the control template use.
StringBuilder markupBuilder = new StringBuilder();
XmlWriter writer = XmlWriter.Create(markupBuilder);
System.Windows.Markup.XamlDesignerSerializationManager manager =
new System.Windows.Markup.XamlDesignerSerializationManager(writer);
manager.XamlWriterMode = System.Windows.Markup.XamlWriterMode.Value;
// data grid named dataGrid1
var template = dataGrid1.Template;
System.Windows.Markup.XamlWriter.Save(dataGrid1.Template, manager);
string markup = markupBuilder.ToString();
If you just looking to change the foreground color of the DataGrid when it's disabled, you should be able to use styles together with triggers rather than replacing the entire template.
<DataGrid>
<DataGrid.Resources>
<Style
TargetType="{x:Type DataGridColumnHeader}">
<Style.Triggers>
<DataTrigger
Binding="{Binding IsEnabled, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}"
Value="False">
<Setter
Property="Foreground"
Value="Green" />
</DataTrigger>
</Style.Triggers>
</Style>
<Style
TargetType="{x:Type DataGridCell}">
<Style.Triggers>
<DataTrigger
Binding="{Binding IsEnabled, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}"
Value="False">
<Setter
Property="Foreground"
Value="Green" />
</DataTrigger>
</Style.Triggers>
</Style>
</DataGrid.Resources>
<!-- Column Definitions -->
</DataGrid>
Adding the above 2 styles to the DataGrid's resources collection will, set the foreground of each column header and data row cell to green when the DataGrid is disabled.

To define the disabled behavior of any control, you should change the Disabled visual state accordingly in the control template.

problem in the textblock style

Hello I am trying to make a textblock that they should focus on the event to underline the text and add when you lose the focus off him.
this is possible?

While I'm not sure if this is supported in Silverlight, this is how you'd do it in WPF:
<xxx.Resources>
<Style x:Key="HoverUnderline" TargetType="TextBlock">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="TextDecorations" Value="Underline"/>
</Trigger>
</Style.Triggers>
</Style>
...
<TextBlock Style="{StaticResource HoverUnderline}"
Content="Point at me to underline."/>
(Another interpretation of your question: use IsFocused instead of IsMouseOver. That's a weirder interpretation though since normally text blocks can't receive focus.)