Edited Issue: CheckComboBox: Delimiter other than a comma = no selection [20763]

Based on discussion https://wpftoolkit.codeplex.com/discussions/534906.

When a CheckComboBox is used in a DataTemplate, has a SelectedValue and its Delimiter is something else than a coma, the selectedValue is not active when loaded.
Comments: ** Comment from web user: BoucherS **

This issue will be fixed in v2.3.

In the meantime, you do the following modification in file :
Xceed.Wpf.Toolkit/Core/Primitives/Selector.cs
In method :
OnDelimiterChanged
Replace :
```
( ( Selector )o ).UpdateSelectedValue();
```
with :
```
Selector selector = (Selector)o;
if( selector.IsInitialized )
{
selector.UpdateSelectedValue();
}
```