Hello Richard Harrigan,
In this case can you try the following.
1. Attach to the EditorCreated event of RadDataFilter.
2. In the event handler, check the name of the property for which the editor has been created.
3. In case this is your decimal property, cast the editor to RadMaskedTextBox and set its mask to "f". Something like this:
sender, Telerik.Windows.Controls.Data.DataFilter.EditorCreatedEventArgs e)
var editor = e.Editor
Meanwhile, I will fix this so that the default editor is created with the "f" mask by default when the type of the property is decimal.
I hope this helps.
the Telerik team
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