The new MultiColumnComboBox control does not have any server side events.  Can you provide the same server side event that you have for the ComboBox? 

Currently, the RadMultiColumnComboBox has smaller height than the AutoCompleteBox or the RadComboBox for example. 

A possible workaround can be using the following styles: 

<style>
    .RadMultiColumnComboBox .k-dropdown-wrap {
        padding: 4px 12px;
    }

    .RadMultiColumnComboBox .k-select {
        width: 1.42857143em;
        height: 1.42857143em;
        position: absolute;
        box-sizing: content-box;
        top: 0;
        bottom: 0;
        right: 0;
        left: auto;
        padding: 6px;
    }
</style>

We have just upgraded to the latest asp.net ajax version and excited about the new control 'RadMultiColumnComboBox', but we could not figure out how we can allow multiple selections.

Please let us know

Thanks,

When search dropdown is open in MultiColumnComboBox and you scroll the page (e.g. by mouse wheel) the dropdown is immediately closed which is quite inconvenient.

Both Combobox and DropDownList keep the dropdown opened when you are scrolling the page.

Could you fix it?
Any temp workaround?

The close icon is vertically misaligned

Steps to reproduce:

1. Go to https://demos.telerik.com/aspnet-ajax/multicolumncombobox/overview/defaultcs.aspx

2. Enter any text in the filter

3. See that the X icon is misaligned