Mutually exclusive Radio buttons for toggling between two group boxes - visual-studio

Question

I want to achieve:
On init () both group boxes are hidden and both GRP A and GRP B radio button enabled [ACHIEVED].
I click on GRP A radio button , GRP box 1 displayed GRP B radio button grayed out. [ACHIEVED].
Uncheck GrP A radio button GRP Box 1 hides both GRP A and B radio buttons enabled [FAILING : NOT ABLE
TO UNCHECK THE SELECTED RADIO BUTTON].
Check Group Box B radio button same process happens as described above.

Answer 1

You are trying to 'break' the concept of radio-buttons. The "GRP A" and "GRP B" buttons (assuming they are in the same 'group') will automatically be mutually exclusive, so long as both are enabled - you have to have one of the buttons checked (even if there are 3 or more in the same group). Thus, in your case, to un-check "GRP A" you will need to check "GRP B".
Unless, of course, you override the default handling of those radio-buttons.
To override the default handling, you can provide a handler for the BN_CLICKED message from the each of the "GRP A" and "GRP B" buttons, and explicitly set the state of both buttons to unchecked and enabled in that handler. You would also put code in that handler to hide the two groups (or show one, when appropriate).
Here's an outline of possible code, assuming your parent dialog is derived from CDialog and the IDs of the two radio-buttons are IDC_GRPA and IDC_GRPB:
BEGIN_MESSAGE_MAP(MyDialog, CDialog)
ON_CONTROL(BN_CLICKED, IDC_GRPA, &MyDialog::OnClickA)
ON_CONTROL(BN_CLICKED, IDC_GRPB, &MyDialog::OnClickB)
//... other handlers and message map entries
END_MESSAGE_MAP()
// Handler for a "GRP A" button click:
void MyDialog::OnClickA()
{
UINT checked = IsDlgButtonChecked(IDC_GRPA);
if (checked == BST_CHECKED) {
GetDlgItem(IDC_GRPB)->EnableWindow(TRUE); // ENABLE other button
CheckDlgButton(IDC_GRPA, BST_UNCHECKED); // Clear this button
CheckDlgButton(IDC_GRPB, BST_UNCHECKED); // and the other one
// Now do the required stuff to HIDE the group boxes...
}
else {
CheckDlgButton(IDC_GRPA, BST_CHECKED); // Check this button
GetDlgItem(IDC_GRPB)->EnableWindow(FALSE); // DISABLE other button
// Now do the required stuff to SHOW the "GrpBox 1" controls ...
}
}
// The "OnClickB()" handler will be very similar to the above, but with the IDs 'reversed'.
Please feel free to ask for any further clarification and/or explanation.