General-use object copy
Matlab's dual internal serialization/deserialization functions can be used to create duplicates of any object.
Internal component
Auto-completion widget
Matlab includes a variety of undocumented internal controls that can be used for an auto-completion component.
CheckboxList
Matlab listboxes can be enhanced with checkboxes next to each item.
Animated busy (spinning) icon
An animated spinning icon label can easily be embedded in Matlab GUI.
Customizing editboxes
Matlab's editbox can be customized in many useful manners
Variables Editor scrolling
The Matlab Variables Editor can be accessed to provide immediate scrolling to a specified cell location.
treeTable
A description of a sortable, groupable tree-table control that can be used in Matlab is provided.
Sparse data math info
Matlab contains multiple libraries for handling sparse data. These can report very detailed internal info.
Parsing mlint (Code Analyzer) output
The Matlab Code Analyzer (mlint) has a lot of undocumented functionality just waiting to be used.
propertiesGUI
propertiesGUI is a utility that presents property-value structs in a convenient table format, useful in Matlab GUIs.