Setting listbox mouse actions
Matlab listbox uicontrol can be modified to detect mouse events for right-click context menus, dynamic tooltips etc.
GUI
Context-Sensitive Help
Matlab has a hidden/unsupported built-in mechanism for easy implementation of context-sensitive help
Setting status-bar components
Matlab status-bars are Java containers in which we can add GUI controls such as progress-bars, not just simple text labels
Setting status-bar text
The Matlab desktop and figure windows have a usable statusbar which can only be set using undocumented methods. This post shows how to set the status-bar text.
GUIDE customization
Matlab's GUI Design Editor (GUIDE) has several interesting undocumented features. This post describes how to customize GUIDE rulers.
Legend '-DynamicLegend' semi-documented feature
The built-in Matlab legend function has a very useful semi-documented feature for automatic dynamic update, which is explained here.
Spicing up Matlab uicontrol tooltips
Matlab uicontrol tooltips can be spiced-up using HTML and CSS, including fonts, colors, tables and images
Uicontrol callbacks
This post details undocumented callbacks exposed by the underlying Java object of Matlab uicontrols, that can be used to modify the control's behavior in a multitude of different events
Button customization
Matlab's button uicontrols (pushbutton and togglebutton) are basically wrappers for a Java Swing JButton object. This post describes how the buttons can be customized using this Java object in ways
Setting system tray popup messages
System-tray icons and messages can be programmatically set and controlled from within Matlab, using new functionality available since R2007b.