ComboBox dynamic adding checkboxes to template

2 posts, 0 answers
  1. Henrik Tegman
    Henrik Tegman avatar
    29 posts
    Member since:
    Apr 2010

    Posted 01 Mar 2011 Link to this post


    I've been searching the forums and found some similar topics but I still can't get it to work so I thought I'd post my own to see what I'm doing wrong.

    My situation is simple, I have a ComboBox and I want the dropdown to have checkboxes, as I understand there is no easy way to just add a checkbox to a ComboBox, instead I have to use the ItemTemplate.

    At the moment I have a class that uses the ITemplate, it has a InstantiateIn method and there it gets the "dynamic" data from a DB.

    It looks something like this, don't mind the extra code it's still very early and just trying to get things to work:

    public void InstantiateIn(Control container)
                object[] searchoptions = GetProxy().GetSearchOptionList();
                DataSet so = (DataSet)searchoptions[0];
                List<SearchOption> searchOpt = new List<SearchOption>();
                for (int k = 0; k < so.Tables.Count; k++)
                    for (int j = 0; j < so.Tables[k].Rows.Count; j++)
                        SearchOption search = new SearchOption();
                        search.ID = so.Tables[k].Rows[j].ItemArray[0].ToString();
               = so.Tables[k].Rows[j].ItemArray[1].ToString();
                        CheckBox box = new CheckBox();
                        box.Text =;
                        box.ID = search.ID;
                        box.DataBinding += new EventHandler(box_DataBinding);

    It simply loops over it and takes out all the data, and attaches a Eventhandler

    private void box_DataBinding(object sender, EventArgs e)
                CheckBox target = (CheckBox)sender;
                RadComboBoxItem item = (RadComboBoxItem)target.BindingContainer;
                string itemText = (string)DataBinder.Eval(item, "Text");
                target.Text = itemText;

    But this doesn't work, the biggest problem is that I don't really get it myself why I have to go on with Templates and all this, I just want a dropdown with checkboxes, so maybe I'm overcomplicating things here or maybe I just don't understand.

    Any help is welcome.
  2. Helen
    Helen avatar
    1052 posts

    Posted 01 Mar 2011 Link to this post

    Hi Henrik,

    Did you review the following help topic:

    Did you try to follow the code in the "Assigning ItemTemplate at runtime" section?

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