Below is a method to generate a random RGB hex color:

// Method: RandomRGBColor // Description: Returns a random RGB Color Hex Value // $0: A valid value from 0x00000000 (0) to 0X00FFFFFF (16777215) C_LONGINT($0) C_INTEGER($red;$green;$blue) $red:=Random%255 $green:=Random%255 $blue:=Random%255 $0:=($red<<16)+($green<<8)+$blue

Below is an example of using the method. The RandomRGBColor method is placed in the button to change the Rectangle Object's (named "Rectangle") color to a random color.

The Method in the button is:

OBJECT SET RGB COLORS(*;"Rectangle";RandomRGBColor ;RandomRGBColor )