Check box column in matrix

Dear All,

I created a matrix with check box columns through XML. I want to check the check box column through vb.net coding.

I used the following coding:

objMatrix.Columns.Item("5").Cells.Item( 1).Specific.checked = True

and

objMatrix.Columns.Item("5").check(1, True)

My xml code for check box column

<column uid="5" type="121" title="Confirm" description="" visible="1" AffectsFormMode="1" width="67" disp_desc="0" editable="1" right_just="0" val_on="Y" val_off="N" backcolor="-1" forecolor="-1" text_style="0" font_size="-1">
			<databind databound="1" table="@SS_RCATR" alias="U_inprc"/>
			<ExtendedObject/>
	</column>

If run the above vb..net coding i am getting error messages

System.MissingMemberException: Public member 'Checked' on type 'IEditText' not found

and

System.MissingMemberException: Public member 'Check' on type 'ColumnClass' not found

respectively.

Can anyone help me to solve this problem?

Regards,

Tamizh.