Other ways to set datasource

[Jo]

I set the datasource of multicolumncombobox everytime dropdown opening event is fired.
But on the first instance, it only show the header and a vertical scroll like 1st.png attachment. It did have rows since if I press downbutton, a row will be selected
while on the second instance and later, it works like 2nd.png attachment.

private void combobox_DropDownOpening(object sender, System.ComponentModel.CancelEventArgs args)
        {
            combobox.DataSource = datatable;
        }

Any suggestions?

[Dimitar]

Hi Joem,

Thank you for writing.

This is not a valid scenario and you should not set the DataSource in this event. The data source should be set before this event is fired so the drop down size can be correctly measured. Since you need to change the data source in such way I will recommend you to use the GotFocus event: 

void radMultiColumnComboBox1_DropDownOpening(object sender, CancelEventArgs args)
{
    radMultiColumnComboBox1.DataSource = null;
    radMultiColumnComboBox1.DataSource = GetTable();
    radMultiColumnComboBox1.DisplayMember = "Name";
}

I hope this helps.

Regards,
Dimitar
Telerik