RAD Studio
Responding to a Mouse-up Action

An OnMouseUp event occurs whenever the user releases a mouse button. The event usually goes to the object the mouse cursor is over when the user presses the button, which is not necessarily the same object the cursor is over when the button is released. This enables you, for example, to draw a line as if it extended beyond the border of the form. 

To respond to mouse-up actions, define a handler for the OnMouseUp event.

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