Subject Re: radio button From Andy Taylor <andy.taylor.1959@outlook.com> Date Mon, 20 Jul 2020 07:04:34 -0400 Newsgroups dbase.getting-started Mervyn, Nice. I will study this so I can get to grips with callback ! Andy > On 2020-07-12 06:42, Mustansir Ghor wrote: > > Dear All > > > > I am using radio buttons where on selection the current data needs to be cleared in the grid. On  selecting I put msgbox for confirmation. If the user says "NO" then I need to restore to original selection. Since on selecting,  the ongotfocus event of object being selected executes, I wonder how we capture the before selection state and use it to restore for "NO" option of user > > The radiobutton object has what appears to be a bug in that the onChange > event fires before the onLeftMouseDown event fires.  This means there is > no opportunity to warn the user of possible consequences before the > actual selection change is made. > > The CALLBACK command was introduced with dBASE Plus 8 and this has given > us the ability to look inside Windows and see keystrokes and mouse > events before dBASE does.  Using  CALLBACK and some Windows API > functions I have managed to put together a custom radiobutton which > looks as if it does what you need. > > The custom control and a test form are attached. > > Mervyn. >