Add this style to your button.
<Button>
<Button.Style>
<Style BasedOn="{StaticResource {x:Static ToolBar.ButtonStyleKey}}" TargetType="Button">
<Style.Triggers>
<Trigger Property="Button.IsMouseOver" Value="True">
<Setter Property="" Value="" />
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
Set your property in SetterandValue
Add <Style BasedOn="Give your default Style here">to save your predefined style.
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