Their own package: Date the Control source (dataX,)-selection list box control source (VALLComboBox). Very convenient for use, can reduce some of the code. Has been tested.

IlzwwDelphiCot\liubingjun控件\CheckTreeView.dcu
..............\..............\CheckTreeView.pas
..............\..............\CheckTreeView.~pas
..............\..............\DateX.dcu
..............\..............\DateX.pas
..............\..............\DateX.~pas
..............\..............\liubingjun.cfg
..............\..............\liubingjun.dcu
..............\..............\liubingjun.dof
..............\..............\liubingjun.dpk
..............\..............\liubingjun.res
..............\..............\liubingjun.~dpk
..............\..............\VALComboBox.dcu
..............\..............\VALComboBox.pas
..............\..............\VALComboBox.~pas
..............\liubingjun控件
IlzwwDelphiCot

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