Since there is no support for more than one style selector we need to find some alternative.
Here is what I can think of at a first glance ( 2 approaches ) :
1. Before having style selectors , we used to bind the background color to a certain property trough an IValueConverter converter.
So you can try this in your scenario - use a style selector for the one condition and binding for the second.
2. Try to combine the logic in a single style selector . Is there something preventing you to combine the logic for both condition in the SelectStyle method of a single style selector ?
* As a side note - I can be more specific and even try give some sample implementation if you give me some more details - e.g. how do you track which item has been modified ? Is this a property on the business object or something else ?
the Telerik team
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