wxPython button tooltips are not working well

wxPython Users
1

Hi,

I am running wxPyton on CentOS 6, I added following button tool tips, but it sometime the tool tips came up when a mouse hover it, sometime it did not show up. Can anyone give an example to use button tooltip reliably?

button1.SetToolTipString (“This is button 1”)
button2.SetToolTipString (“This is button 2”)

Thanks.

Kind regards.