Author: Tomas Rutkauskas

I have a form that contains a radio groupbox with 4 items associated with it and a 
checklistbox with 4 items as well. In this case the radio box dictates which items 
in a checklistbox can be selected. For example, if the radio groupbox is set to 
item 3, that means only the first 3 items in the checklistbox can be selected. 
Therefore, if the user changes the radiobox setting to the second item, only the 
first 2 selections in the checklistbox are allowed to be marked and the third item 
that was previously checked should be cleared.

Answer:
1   
2   procedure MyProc(RadioBoxSender: TRadioGroup; CheckListBoxSender: TCheckListBox);
3   var
4     I: Integer;
5   begin
6     with CheckListBoxSender do
7       for i := 1 to 3 do { no need to do 0}
8         if i > RadioBoxSender.ItemIndex then
9           checked[i] := false;
10  end;