Custom Graphic User Interface Modifier, developed by MKlejnowski, is a scripted modifier plugin for 3ds Max that lets you create a GUI picker tool without any knowledge of MaxScript. It supports up to 100 buttons, and each one can be customized for size, position, color, text, style, and function.
Beyond the buttons themselves, the plugin supports MaxScript and group features, and includes import and export so setups can be moved in and out. A drop-down list helps switch between multiple CGUI modifiers within a scene, and a minimize button option is available. Installation involves placing the script into one of the provided 3ds Max locations, including the Scripts\Startup directory for loading from startup.
The version listed here is 3.1, which fixed a bug that deleted undo history when the MaxScript event was used on a button. Version 3.0 brought a UI redesign along with the import and export feature. It's compatible with 3ds Max 2009 and later. Note that save files from version 1.5 or lower will not work with 2.0 or higher.