WPF Change color of Rectangle placed inside Button

Question

I've got a rectangle in a button and want to change it's color. How can i Do that?

<Button Click="btnInitial_Click" Margin="0, 5, 0,0" Grid.Row="3" Grid.Column="3" Name="btnInitial">
       <Button.Template>
            <ControlTemplate>
                <Rectangle Name="rectInitial" Stroke="Black" Fill="#4169e1"></Rectangle>
            </ControlTemplate>
       </Button.Template>
</Button>

//EDIT: I want to change it in its own Click Event.

Answer 1

There are many ways to do so, depending on where you want to set it. If you want to set it from code-behind you can to it like this:

var rect = btnInitial.Template.FindName("rectInitial") as Rectangle;
rect.Fill = Brushes.Aquamarine;