Flex Control have the following objects to use creating your UI.

• Layout:  Organize objects in a group. 
• Grid Layout:  Same as Layout with a grid.
• Label:  Add text to the UI.
• Button:  Simple button with text.
• Image Button:  Button with image for on/off state.
• Progress Circle:  Progress display shaped as a circle.
• Page Control:   Add pages with objectes to the UI.
• Slider: Slider object to send values back to the server or plugin.
• Progressbar: Takes a variable and set the progress bar value.
• IconButton: A button with text and a icon.