Hi Michael Warden,
Please try the following sample code snippet to achieve your scenario.
ASPX:
<
telerik:RadListBox
ID
=
"RadListBox1"
runat
=
"server"
TransferToID
=
"RadListBox2"
DataSourceID
=
"SqlDataSource1"
EnableDragAndDrop
=
"true"
AllowTransferDuplicates
=
"true"
AllowTransfer
=
"true"
DataTextField
=
"Name"
AutoPostBackOnTransfer
=
"true"
>
</
telerik:RadListBox
>
<
telerik:RadListBox
ID
=
"RadListBox2"
runat
=
"server"
TransferToID
=
"RadListBox3"
EnableDragAndDrop
=
"true"
AllowTransferDuplicates
=
"true"
AllowTransfer
=
"true"
AutoPostBackOnTransfer
=
"true"
Height
=
"100px"
>
</
telerik:RadListBox
>
<
telerik:RadListBox
ID
=
"RadListBox3"
runat
=
"server"
TransferToID
=
"RadListBox1"
EnableDragAndDrop
=
"true"
AllowTransferDuplicates
=
"true"
AllowTransfer
=
"true"
AutoPostBackOnTransfer
=
"true"
Height
=
"100px"
>
</
telerik:RadListBox
>
Thanks,
Princy.