Jeremy
I suspect you need to derive from a slightly lower down the tree class so
you have a canvas to draw on ..
The help file for TWinControl says ...
Newly created components are seldom derived directly from TWinControl. Base
most new controls on TCustomControl, which provides a canvas and handles
paint messages, or on any of several more specialized controls, such as
TButtonControl, TCustomComboBox, TCustomEdit, or TCustomListBox.
Hope it helps :-)
Paul
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