To Do

Priority: Unicode Support (UTF-8) in Windows and Motif.
Priority: Interactive Dialog Editor
Priority: A tutorial section in the documentation. One big Controls Demo just like GTK, wxWidgets and Qt have. Code snippets collection.
Priority: support for image and text at the same time in IupLabel.
Important: RPM, Debian and LuaRocks distribution packages.
Important: Customization of IupGetParam to add other applications controlled elements.
Important: IupGLCanvas in MACOS X using native OpenGL support.
A MacOS X native driver using Carbon or Cocoa.
The actual model for control data structure in the internal SDK is restricted for derived classes.
Loading and saving RTF files in IupText. Add support for images inside the text.
Possibility to change the system menu in Windows. Support for cascading IupPopup for menus.
Support for Portuguese in the IupView application.
Vertical text in labels and buttons.

Known Issue: when in Windows 8 the IupFontDlg dialog does not supports the TITLE attribute nor can be positioned.
Known Issue: when an IupVal is inside an IupTabs, the tabs disappear when the mouse moves over it after being used in the valuator. A workaround is to put the valuator inside an IupFrame and then inside the IupTabs, so the problem does not occur.
Known Issue: when the dialog background is dynamically changed the IupVal background is only updated after the user click on the control or when the control is redisplayed.
Known Issue: in Windows Vista the COMPOSITE=YES attribute of the IupDialog is not working as expected. There is still flicker when the dialog is resized. IupTabs in Windows Vista when COMPOSITE=YES works only if MULTILINE=YES. (since 3.0)
Known Issue: in Windows when CANFOCUS=NO only the Tab key navigation is not done, when clicked the control will still get the focus. The only exceptions are button and canvas.
Known Issue (Compiler): the IupImgLib takes an very long time to compile under Visual C++. (since 3.0)
Known Issue (Compiler): when building with Open Watcom the additional controls crash. When you add debug information to the main IUP library the problem solves. We tried to track down this error but it does not occurs with debug information and our attempts without debug does not gives any results. So the IUP main library for Watcom is now distributed with debug information. (since 3.0)

Known Issue: can not set focus to a child inside TABCHANGE_CB or TABCHANGEPOS_CB in IupTabs, because internally GTK will always set the focus to the first child.
Known Issue: in Ubuntu 11.10 the canvas scrollbar is not notifying IUP that the user dragged the control. To solve the problem remove the overlay-scrollbar, this is the package that makes the scrollbar invisible until the mouse is near it.

Known Issue: when the IupList has DROPDOWN=Yes in Motif, and the list has items with the same string, the ACTION callback will return the index of the item with the first instance of the string only. This seems to be a bug or limitation in Motif.
Known Issue: an element when inside an IupScrollBox is not being displayed until the box is scrolled if its size alone is greater than the scrollbox visible size.
Known Issue: IupMatrix crash the application during its creation on OpenMotif 2.3.3. inside the creation of the internal IupList.

Known Issue: the rubber band gets lost depending on what you do inside the SELECTION_CB callback in GTK. To avoid that set RUBBERBAND=NO.
Known Issue: the SELECTION_CB callback may be called more than once for the same node with the same status.
Known Issue: in Windows XP, when using a font for an node with TITLEFONTid in IupTree that is larger than the element FONT the item text will be cropped at right and bottom because the system uses the element font to calculate the item size. The only exception is when you just change the font to add a Bold style.
Important: old NAMEid attribute conflicts with the common attribute NAME. Should be replaced by the new TITLEid. NAMEid will be removed in future versions. (since 3.0)
RENAMEEDIT_CB callback and RENAMEMASKid attribute.
Add new nomenclature option for id, for example ":2:1:4"
Define minimum size based on tree nodes.
drag&drop of multiple selected nodes.

Allow to select multiple nodes at once dragging the mouse within a region.
Add support of legend text near each dataset plot.
Adjust AutoScale to start and end at major axis ticks.
Improve the display of values near each sample.
Custom legend position.
PPlot force the definitions of the margins. It should have a way to automatic calculate the margins when doing automatic scaling.
PPlot force the Grid to be automatically spaced following the major ticks.
PPlot generates lots of warnings on all compilers.