Problem boolean column in Data Grid

One of my columns in my DataGrid is a boolean column. When adding a row via the append row the check box for this boolean will appear greyed out. This I assume means that the value stored in the dataset is null. If I change this value and leave the cell, the value for this boolean will revert back to greyed out box rather than be ticked or un-ticked. Ticked Value will only remain if I explicitly define string values for true and false... like....

Code:

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        Col9.TrueValue = "ticked"

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Is this normal????.... I just want a boolean column that saves 0 or 1 in the data set so I can handle boolean values... What am I doing wrong!??!...agggh


I was wondering if anyone else has had a problem like this and can help!! I'm a VB.NET newbie (only 2-3 Weeks :/).. Have been struggling through Data Grids for ages!!!

here's the code..

Code:

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        myDataSet = New DataSet("myDataSet")
        Dim theTable As DataTable
        theTable = New DataTable("theTable")
     
        Dim Col9 As DataColumn
        Col9 = New DataColumn("Col9")
        theTable.Columns.Add(Col9)

        Dim ts1 As DataGridTableStyle
        ts1 = New DataGridTableStyle()
        ts1.MappingName = "theTable"
        ts1.AllowSorting = False
        ts1.GridLineStyle = DataGridLineStyle.Solid
        ts1.RowHeadersVisible = False

        Dim Col9 As New DataGridBoolColumn()
        Col9.MappingName = "Col9"
        Col9.AllowNull = False
        Col9.Width = 40
        ts1.GridColumnStyles.Add(Col9)

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I was also wondering if there was a way of creating a default value for the boolean when the row is created. So that when a new append row appears it's either ticked or unticked....

thanks for any help... :confused: