Wpf Extended toolkit CheckComboBox Question

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Windows

XAML

WPF

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Dear Experts,

In my WPF project we are using WPF Extended toolkit version 1.8.0

Here i have taken CheckComboBox in XAML Like Below

<xctk:checkcombobox height="20" name="LocaleSelector"                              Margin="226,12,26,429" ItemSelectionChanged="LocaleSelector_ItemSelectionChanged"> </xctk:checkcombobox>

Then in my code view we are binding with the database.

public void BindComboBox()
        {
            try

            {
                SqlConnection conn = new SqlConnection(str);
                SqlDataAdapter da = new SqlDataAdapter("select Department_Name from Dept", conn);
                DataSet ds = new DataSet();
                da.Fill(ds, "dept");
                Selector sel = new Selector();
                LocaleSelector.Items.Add("All");
               if (ds.Tables["dept"].Rows.Count > 0)
                {
                    foreach (DataRow dr in ds.Tables["dept"].Rows)
                    {
                     LocaleSelector.Items.Add(dr["Department_Name"]);
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

This code is working fine. but we need that when user selects All from the checkcombobox then we want disable or make readonly or something else for remaining items from the checkcombobox and vice-versa.

Please provide me your valuble ideas to implement this.