Posted 31 Oct 2013
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I have the same issue, but it's the radDropDownList that will not show, however, the radMultiColumnComboBox worked just fine.
Here is my Telerik related GAC items:
Telerik.WinControls, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.ChartView, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.CodedUI.2010, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.GridView, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.PdfViewer, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.PivotGrid, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.RadChart, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.RadDock, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.RadMarkupEditor, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.RichTextBox, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.Scheduler, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.SpellChecker, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.Themes.Aqua, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.Themes.Breeze, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.Themes.Desert, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.Themes.HighContrastBlack, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.Themes.Office2007Black, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.Themes.Office2007Silver, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.Themes.Office2010Black, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.Themes.Office2010Blue, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.Themes.Office2010Silver, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.Themes.TelerikMetro, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.Themes.TelerikMetroBlue, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.Themes.TelerikMetroTouch, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.Themes.VisualStudio2012Dark, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.Themes.VisualStudio2012Light, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.Themes.Windows7, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.UI, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
Telerik.WinControls.UI.Design, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
TelerikCommon, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL
TelerikData, Version=2013.1.220.40, Culture=neutral, PublicKeyToken=5bb2a467cbec794e, processorArchitecture=MSIL