General
Under General you give the button a name, enter a (mouse over-) hint, which
appears when the user moves the mouse over the button and specify if the
button is visible in design mode.
Behaviour
This is where you choose what the button should do, enter parameters and
assign a sound to the button, which is played when the button is pressed.
Graphic
Here you assign your own graphics to the button. A real button has several
graphics for different possible state (Default, Touched, Presses, Disabled),
which can all have a different appearance. Click
on the preview images once in order to display the graphic in your design
area. Click on the preview images a second time to open a file dialog
for choosing your own graphic. You may as well click on Filename
for choosing a graphic among all project graphics. Choose an invisible
color as Alpha color, for achieving transparency for shaped objects.
How to edit a button graphic
in your graphics editor:
Select the graphic to edit by clicking on it once and click the Edit
image button. This will open the graphic in the application that
has been assigned to this file type under File->External
Editors...

Tip: For optimal results the size of the
four images of a button should be the same but they don't need to be.
Next to the label Source you find the width and height of the active
image.
Alignment
Give the button a reference point on the user interface (MainDialog), where
to align itself when the size of the application is changed.
Related
topics:
Button object
Actions
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