RadControls for WinForms
Contents

Design-time Binding

The easiest way to bind the combobox in by setting the DataSource in design-time:

This will cause the RadGridView (contained in multi-column combobox) auto-generate columns for each field in the specified datasource. 

 Columns collection

You can set your own columns list using the Columns collection editor of RadGridView:

The collection editor is accessible through:

RadMultiColumnComboBox -> MultiColumnComboBoxElement -> EditorControl -> MasterGridViewTemplate -> Columns

Programmatically Binding the ComboBox

You can bind the combobox control programmatically in your application code. The important point is to turn of the automatic generation of columns, otherwise you will have your columns duplicated in runtime.

Copy[C#]
protected override void OnLoad(EventArgs e)
{
    base.OnLoad(e);

    NwindDataSet nwindDataSet = new NwindDataSet();
    CustomersTableAdapter customersTableAdapter = new CustomersTableAdapter();
    customersTableAdapter.Fill(nwindDataSet.Customers);
    this.radMultiColumnComboBox1.DataSource = nwindDataSet.Customers;
    foreach (GridViewDataColumn column in
     this.radMultiColumnComboBox1.MultiColumnComboBoxElement.Columns)
    {
        column.BestFit();
    }
}

void SetUpGrid()
{
    RadGridView gridViewControl = this.radMultiColumnComboBox1.EditorControl;
    gridViewControl.MasterTemplate.AutoGenerateColumns = false;
    gridViewControl.Columns.Add(new GridViewTextBoxColumn("CustomerID"));
    gridViewControl.Columns.Add(new GridViewTextBoxColumn("ContactName"));
    gridViewControl.Columns.Add(new GridViewTextBoxColumn("ContactTitle"));
    gridViewControl.Columns.Add(new GridViewTextBoxColumn("Country"));
    gridViewControl.Columns.Add(new GridViewTextBoxColumn("Phone"));
}
Copy[VB.NET]
Protected Overrides Sub OnLoad(ByVal e As EventArgs)
    MyBase.OnLoad(e)

    Dim nwindDataSet As New NwindDataSet()
    Dim customersTableAdapter As New CustomersTableAdapter()
    customersTableAdapter.Fill(nwindDataSet.Customers)
    Me.RadMultiColumnComboBox1.DataSource = nwindDataSet.Customers
    For Each column As GridViewDataColumn In Me.RadMultiColumnComboBox1.MultiColumnComboBoxElement.Columns
        column.BestFit()
    Next column
End Sub

Private Sub SetUpGrid()
    Dim gridViewControl As RadGridView = Me.RadMultiColumnComboBox1.EditorControl
    gridViewControl.MasterTemplate.AutoGenerateColumns = False
    gridViewControl.Columns.Add(New GridViewTextBoxColumn("CustomerID"))
    gridViewControl.Columns.Add(New GridViewTextBoxColumn("ContactName"))
    gridViewControl.Columns.Add(New GridViewTextBoxColumn("ContactTitle"))
    gridViewControl.Columns.Add(New GridViewTextBoxColumn("Country"))
    gridViewControl.Columns.Add(New GridViewTextBoxColumn("Phone"))
End Sub