SpQueryButtonCheckstate

Returns the checked state of the button control specified.

Syntax: isChecked = spQueryButtonCheckstate ( hwndDlg, buttonID )

Parameters:
 * hwndDlg – Dialog window handle which owns the button to be queried.
 * buttonID – Button control identity.

Returns:
 * 0 – The button control is in unchecked state.
 * 1 – The button control is in checked state.
 * 2 – The button control is in indeterminate state.