RAD Studio VCL Reference
TCustomUpDown.Associate Property

Specifies a companion control for the up-down control.

property Associate: TWinControl;
__property TWinControl * Associate;

Use Associate to link the up-down control to a companion control (sometimes called a buddy window). The up-down control automatically positions itself on the outer edge of the companion control and adjusts its height to match the companion control. 

At design-time the companion control does not move with the up-down control. To keep the up-down control and its companion control together at design time, either multi-select both controls before moving them, or first move the companion control and then reset the Associate property for the up-down control. 


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