Hi all,

I am using a XamGrid as a global control placed in my masterpage;

Throughout the application life it needs to change data many time, regarding the page it is on

In XAML I have:

ItemsSource="{Binding GridDataCollection}"

I also change the columns of the grid;
For this, my ViewModel sends a message to the view and it creates the columns
(there was no way of doing this otherway before, is there some binding technique for this now?)

MY PROBLEM:
From the second creation of columns on, I get an exception when creating columns for the grid;
(Invalid Key exception is thrown)
When I create these columns, they must correlate with the ItemsSource type of items;

WITH DEBUGGING:
- I have seen that the ItemsSource property still contains the elements from the previous grid!
- Assured that the creation of columns is triggered after DataContext property is changed
- The ItemsSource property was refreshed on the third loading with data from the second loading

Please tell me how can I know when to create my Columns?
When the ItemsSource will be changed?

I really need a fix for this and I will appreciate any kind of help or hints

Thanks in advance