Custom UI Elements with Eto.Forms

I’d start with creating basic Mouse/Keyboard events and drawing custom geometry in DrawOverlay

Rhino.Display.DisplayPipeline.DrawOverlay += DisplayPipelineEvents.DrawOverlay;

public static void DrawOverlay(object sender, DrawEventArgs e)
{
if (Display.OnScreenWidget != null)
    {
    Display.OnScreenWidget.OnDrawOverlay(e);
    }
}

public void OnDrawOverlay(DrawEventArgs e)
{
// your drawing code goes here
e.Display.Draw...
}
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