I just answered your support ticket with this question. Please, if you have any questions about the suggested solution, post them there, so that we avoid duplicate posts.
Here is what is the suggestion:
You should be able to do it the same way as with regular grid columns. Here is how I made out Google-like filtering demo put a default filter for Country=Germany:
In case you have disabled linq expressions, use
sender, EventArgs e)
"(Convert.ToString(it[\"Country\"]) = \"Germany\")"
GridColumn column = RadGrid1.MasterTableView.GetColumnSafe(
column.CurrentFilterFunction = GridKnownFunction.Contains;
"([Country] LIKE \'%Germany%\') "
for a filter expression.
More on creating filter expressions you can find here:
I hope this helps.
the Telerik team
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