0: left
 1: center
 2: right
 

If set to true (which is the default), the button control automatically grabs the focus when the user clicks onto it with the mouse.
If set to false, the focus is preserved when the user operates the button control with the mouse.

Valid values of this property are specified with ImagePosition.

If this property is present, it supersedes the ImageAlign property - setting one of both properties sets the other one to the best possible match.

If this property is present, it interacts with the ImageURLin the following way:

• If ImageURL is set, Graphic will be reset to an object as loaded from the given image URL, or NULL if ImageURL does not point to a valid image file.
• If Graphic is set, ImageURL will be reset to an empty string.

Normally, when you click a button with the mouse, you need to release the mouse button, and press it again. With this property set to true, the button is repeatedly pressed while you hold down the mouse button.

When the user presses a mouse in a control area where this triggers an action (such as pressing the button), then usual control implementations allow to repeatedly trigger this action, without the need to release the mouse button and to press it again. The delay between two such triggers is specified with this property.

If this property is set to true, a single operation of the button control (pressing space while it is focused, or clicking onto it) toggles it between a pressed and a not pressed state.

The default for this property is false, which means the button behaves like a usual push button.