Operating Picture Button Controls
When you set a picture button control to any mode other than indicator mode, you can operate it from the keyboard or with the mouse.
There are two styles of picture button control: picture command button (CTRL_PICTURE_COMMAND_BUTTON), and picture toggle button (CTRL_PICTURE_TOGGLE_BUTTON).
You operate a picture command button in the same way as you would a command button.
You operate a picture toggle button in the same way as you would a toggle button.