To reproduce: 
- Set the text of the RadMaskedEditBox.
- Set The text again and you will notice that the second time the text is not set.

Workaround:
radMaskedEditBox.Value = null;
radMaskedEditBox.Value = _dateValue.ToString("dd.MM.yyyy");

Resolution: 
Set the InsertKeyMode to Insert/Overwrite of the StandartCharacterMaskEditBoxProvider to turn off/on text insertion. Here is the code snippet: 
StandartCharacterMaskEditBoxProvider charProvider = ((StandartMaskTextBoxProvider)this.radMaskedEditBox1.MaskedEditBoxElement.Provider).TryGetStandardProvider();
charProvider.InsertKeyMode = InsertKeyMode.Overwrite;

RadTextBoxControl - you can not type more than one polish char -"Ä…". 

Steps to reproduce:

Change keyboard to Polish(programmers)
Type "Ä…" while pressing right alt.

Workaround:
Use RadTextBox instead RadTextBoxControl.

If you have a GridViewMaskBoxColumn with MaskType set to E-mail and you try to enter and commit a value in this column, you get an exception.

One should be able to disable the saving of the custom colors. In addition one should be able to override the color dialog FormClosing method.

To reproduce:
- Add RadDateTimepicker and bind it to a bindingsource.
- Set the AutoSelectNextPart property to true.
- Set the datasource of the binding source. 
- The AutoSelectNextPart property is reset to false.

Workaround:
- Set the property after the bindingsource is initialized.

1. Add RadTextBoxControl and RadSpellChecker
2. Set the AutoSpellCheckControl property to radTextBoxControl1
3. Type text "(a) is (b) is (c) (d)" and you will see that the letters in parentheses are underline like incorrect. 

To reproduce: add a RadSpellChecker and a RadTextBoxControl. Set the RadSpellChecker.AutoSpellCheckControl property to the RadTextBoxControl.
Please refer to the attached screenshot.

Workaround:
Dim tbSpellChecker As TextBoxSpellChecker = Me.RadSpellChecker1.GetControlSpellChecker(GetType(RadTextBoxControl))
Dim fi As FieldInfo = GetType(TextBoxSpellChecker).GetField("punctuation", BindingFlags.NonPublic Or BindingFlags.Instance)
Dim chars As Char() = " .,;:!?-\\/|~!@#$%^&*()_+=".ToCharArray()
fi.SetValue(tbSpellChecker, chars)

To reproduce: 
1. Drag and drop RadColorBox
2. Add localization provider. Use the following article http://www.telerik.com/help/winforms/forms-and-dialogs-colordialog-localization.html
3. Open ColorDialogForm and choose color which name was localized too. Close the form 
54 You will see that the text of RadColorBox is not localized name, it`s system name. 

Workaround: 
1. Subscribe to the ValueChanged event
2. Replace the text of RadColorBox with localized color name

void radColorBox_ValueChanged(object sender, EventArgs e)
{
    string localizedColor = Telerik.WinControls.UI.ColorDialogLocalizationProvider.CurrentProvider.GetLocalizedString(this.radColorBox.ColorDialog.SelectedColor.Name);
    this.radColorBox.ColorBoxElement.TextBoxItem.Text = localizedColor;
}

Add IME support to RadTextBoxControl and RadAutoCompleteBox.

To reproduce:

Add a RadTextBoxControl  and start the application. Start the touch keyboard of windows and switch to handwriting mode (by clicking at the bottom right of the keyboard on the little keyboard icon). Type a letter and insert it. You will see that the letter will be inserted twice and the TextChanged event will be raised twice.

Workaround:

Use RadTextBox instead.

When the IP is set like this:
this.radMaskedEditBox1.Value = "89.111.222.123";
the value in the box is not correct:
891.112.221.23

In addition the user should be able to insert digits not just replace them. 

When one is typing using Chinese characters, each character is inserted twice.

If negative numbers are required to be displayed in brackets , e.g. ($1234,56) instead of -$1234,56, you should apply the desired NumberFormatInfo.CurrencyNegativePattern http://msdn.microsoft.com/en-us/library/system.globalization.numberformatinfo.currencynegativepattern(v=vs.110).aspx
However, the NumericCharacterTextBoxProvider clears the brackets.

CultureInfo culture = CultureInfo.CreateSpecificCulture("en-US");
NumberFormatInfo info = new NumberFormatInfo();
info.CurrencyNegativePattern = 0; 
info.CurrencySymbol = "$";
culture.NumberFormat = info;        
this.radMaskedEditBox2.Culture = culture;
this.radMaskedEditBox2.MaskType = Telerik.WinControls.UI.MaskType.Numeric;
this.radMaskedEditBox2.Mask = "c2";            
this.radMaskedEditBox2.Value = -1234.56; 

When the user is typing before already typed text, the text is overridden. Add the ability to insert characters instead of replacing them like in the .Net MaskedTextBox.

The ToolTipTextNeeded is never fired for this element, and setting the ToolTipText for TokenizedTextBlockElement in TextBlockFormatting does not apply a tooltip for the element.

Workaround - set the ShouldHandleMouseInput to true:

  void radAutoCompleteBox1_TextBlockFormatting(object sender, TextBlockFormattingEventArgs e)
        {
            TokenizedTextBlockElement token = e.TextBlock as TokenizedTextBlockElement;
            if (token != null)
            {
                token.ToolTipText = "Testing Tooltip";
                token.ShouldHandleMouseInput = true;
            }
        }

The null text is drawn one pixel closer to the bottom of the control.

To reproduce use the following code:  

radDateTimePicker1.Format = DateTimePickerFormat.Custom;
radDateTimePicker1.CustomFormat = "MM/dd/yyyy hh:mm tt";
(this.radDateTimePicker1.DateTimePickerElement.TextBoxElement.Provider as MaskDateTimeProvider).AutoSelectNextPart = true;

now, in the first part, type in "10" and you will be auto moved to the second part. Then, press back, to go back to the first part, and try to type in "01" (entering January). The result is that when you press "0" you are moved to the second part, hence "01" cannot be entered.