Linear Gradient Brush in VB.NET

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VB

WPF

Hi

Can anyone help.

I have a several buttons on a WPF window that I have used a horizontal Linear Gradient Bursh on when placing them on the form, using the property box.

When the button has been clicked I want the color of the gradient to change, I no longer want to to appear as Gold to White, the colour before it is clicked, I now want to to go from Green to White.

I am having real problems trying to make the brush, I am importing System.Drawing and System.Drawing.Drawing2D and the code I am trying to use is below.

Dim linGrBrush As New LinearGradientBrush(New System.Drawing.Point(0, 1), New System.Drawing.Point(0, 0), System.Drawing.Color.ForestGreen, System.Drawing.Color.White)

If ntControl.IntroComp = True Then
    btnLesson1.Visibility = Windows.Visibility.Visible
    btnIntroduction.Background = linGrBrush
End If

The error I am getting says that type System.Drawing.Drawing2D.LinearGradientBrush cannot be converted to System.Windows.MediaBrush.

I am sorry if the error I am making is simple but I am pretty new to WPF all I want to do is change the background of the button.

Any Help would be much appreciated.

Kind Regards

Dave