I swiched from WPF to Silverlight, i heard that WPF & SL are same, but some of the key changes or can say missing parts such as Event and Data Triggers, class hierarchy are really some time annoying to understand. It will be great if we have Silverlight totally web based WPF. Hope Microsoft silverlight team is progressing in the same direction for standardizing this thing.

support for defining custom routed events like WPF

because the flow doc can able to insteed
part of many controls is functions on the user interface,so the section need to be improvement.

Support to Blending Modes, MUltiply, Overlay, Lighten etc

In SL4 it is hard to find the location of an image in the text (between which words). If images and text would be more equal citizens of a RichtTextBox, manipulations would be easier.

Builtin support for clipboard use by images would also be nice, though a workaround is not that hard.

fix the bug, this could be very useful on doing erp

I am able to set the foregroundproperty for those TextPointer in the richTextBox but I cant find any property for the backgroundcolor.
How is it possible to set the background for this selected area in the richTextBox?

TextPointer currentpointer = richTextBox1.Selection.Start; TextPointer tmp1 = currentpointer, tmp2 = currentpointer; tmp1 = tmp1.GetNextInsertionPosition(LogicalDirection.Backward); tmp1 = tmp1.GetNextInsertionPosition(LogicalDirection.Backward); richTextBox1.Selection.Select(tmp1, tmp2); richTextBox1.Selection.ApplyPropertyValue(Run.ForegroundProperty, Colors.Red);

Similar to the WinFormsHost control in WPF, please make a XnaHost control for Silverlight. This would allow for EASY integration of XNA within Silverlight. The key idea is to be able to use Silverlight for the 2D user interface development.

Add support in Silverlight for compliance with WCAG and Section 508 standards. Specifically for text entry, checkboxes, and standard data entry forms built using Silverlight.

Currently only Bankers rounding is supported in Silverlight. Both MidpointRounding models of rounding (in core CLR) are desirable so that when calculations which are displayed (along w/ supporting data) are reproducible w/ Excel etc.

Make it possible to change TextBox Foreground value in ControlTemplate's elements like DisabledVisualElement or ReadOnlyVisualElement. It is not possible because " VisualState inside Template can only set element property defined inside Template".

Or will Silverlight 5 and RelativeSource binding's FindAncestor mode make this possible?

Get Silverlight on more machines. Not exactly a feature but something MS could improve if they devoted more resources to it.

Consider a control that looks like a yardstick or ruler. There's a bunch of tick marks with numbers underneath, and the ticks are centered to the tick mark. The control's bounds need to include the text, which means you need a margin on the tick marks themselves that changes size depending on the FontSize. There are multiple other controls I've built where such "relative margins" are very necessary.

There is need to access local hardware controlled by a native software layer (e.g. cardreader, pin pad, some futher special electronics).

packaged installer of Silverlight + WCF RIA Services (maybe even include a small DB) for out-of-browser desktop usage

Implement DataGrid.SetDetailsVisibilityForItem (same as in WPF)

TextBlock needs a TextChanged event. The Text is using binding and when NotifyPropertyChanged occurs, I need to have a UI event.

More xap packet share a objects sharing its real-time status

For example, there are several different HTML page, each with different xap bag, and these xap without quoted relationship between packets
How to make these xap packages can be based on a Shared object between each other through the objects communicate?