The following code uses ClientRect to find and draw a line from the upper left to the lower right of the current control. Select a TControl in the ListBox list. This example assumes that the current object is a descendant of TControl and has a public Canvas property.
if (ListBox1.Items.Objects[Index] is TStatusBar) then begin myStatusBar:= (ListBox1.Items.Objects[Index] as TStatusBar); with myStatusBar.ClientRect do begin // Make sure you are using the canvas of the TControl, and not the from's canvas. myStatusBar.Canvas.MoveTo(Left, Top); myStatusBar.Canvas.LineTo(Right, Bottom); end; myStatusBar:= nil; end;