Change the opacity RangeCursor programmatically

Hi, I'm changing the look of the chart by programming RangeCursor.

That's what I

rangeCursor.Visibility = System.Windows.Visibility.Visible;
rangeCursor.CrosshairBrush = Brushes.Red;
rangeCursor.FillBrush = Brushes.Red;
rangeCursor.FillBrush.Opacity = 0.25f;

Everything works until the last line where I try to set the opacity.  I get this error:

An exception of first chance of type 'System.InvalidOperationException' occurred in WindowsBase.dll

Additional information: unable to set a property on the object '#FFFF0000' because it is in a read-only State.

If there is a handler for this exception, the program can continue safely.

Is it possible to avoid it?  I have actually even need to change opacity by programming, but when I put FillBrush to red it changes the XAML setting hardcoded 25 to 100%.  This is why I am trying to add this line.

Thank you!

The WPF Brushes class returns shared brushes, which are in a State (read-only) frozen. This avoids a local change to a brush to any other object in the application that happened to use the same brush.

As described in Freezable Objects Overview, to modify a frozen object simply call the Clone method and together Opacity on the result.

Tags: NI Software

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