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In C#, WPF I've created a rectangle: Rectangle myRgbRectangle = new Rectangle(); myRgbRectangle.Width = 1; myRgbRectangle.Height = 1; SolidColorBrush mySolidColorBrush = new SolidColorBrush(); Yes, I really just want it to be 1 pixel by 1 pixel. And I want to change the color based on the variable height like so: mySolidColorBrush.Color = Color.FromArgb(255, 0, 0, (byte)height); myRgbRectangle.Fill = mySolidColorBrush; Now, how do I draw at a specific x,y location on the screen? I do have a grid (myGrid) on my MainWindow.xaml. Thanks! Here's the pertinent code: myRgbRectangle.Width = 1; myRgbRectangle.Height = 1; SolidColorBrush mySolidColorBrush = new SolidColorBrush(); int height; for (int i = 0; i < ElevationManager.Instance.heightData.GetLength(0); i++) for (int j = 0; j < ElevationManager.Instance.heightData.GetLength(1); j++) { height = ElevationManager.Instance.heightData[i, j] / 100; // Describes the brush's color using RGB values. // Each value has a range of 0-255. mySolidColorBrush.Color = Color.FromArgb(255, 0, 0, (byte)height); myRgbRectangle.Fill = mySolidColorBrush; myCanvas.Children.Add(myRgbRectangle); Canvas.SetTop(myRgbRectangle, j); Canvas.SetLeft(myRgbRectangle, i); And it's throwing this error: Specified Visual is already a child of another Visual or the root of a CompositionTarget.

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