Auto Grid Resizing

2 posts, 0 answers
  1. Ben
    Ben avatar
    6 posts
    Member since:
    Mar 2013

    Posted 11 Apr 2013 Link to this post

    Hi there,

    I have a radMultiColumnComboBox1 which resizes the contents of its dropdown grid perfectly the first time its DataSource is set. It doesn’t resize itself, however, upon subsequent assignments to its DataSource.

    This is illustrated by the two attachments. In “DataSourceSetForFirstTime.png,” everything looks great. In “DataSourceSetTheSecondTime.png,” however, the grid retains its original width even though the data no longer necessitates it.

    The code I have is shown below. (As the commented out portions suggests, I’ve tried a number of things.) Can you please help me get the grid to resize itself whenever its DataSource changes?

                    radMultiColumnComboBox1.AutoFilter = true;

                    radMultiColumnComboBox1.EditorControl.MasterTemplate.ShowRowHeaderColumn = false;

                    RadGridView gridViewControl = this.radMultiColumnComboBox1.EditorControl;

                    gridViewControl.MasterTemplate.AutoGenerateColumns = false;


                    //Specify the columns which the dropdown should show

                    for (int i = 0; i < lookupDescription.fields.Count(); i++)

                        gridViewControl.Columns.Add(new GridViewTextBoxColumn(lookupDescription.fields[i]));

                    //Set the suggestions

                    radMultiColumnComboBox1.DataSource = suggestions;

                    //Tweak the width.

                    radMultiColumnComboBox1.AutoSizeDropDownToBestFit = true;

                    radMultiColumnComboBox1.BestFitColumns(true, true);

                    //gridViewControl.AutoSize = true; //This breaks things

                    //gridViewControl.AllowAutoSizeColumns = true; //This has no visible affect

                    radMultiColumnComboBox1.MultiColumnComboBoxElement.TextBoxElement.Text = comboText.curVal;





                    radMultiColumnComboBox1.DropDownSizingMode = SizingMode.UpDownAndRightBottom;


                    radMultiColumnComboBox1.MultiColumnComboBoxElement.UpdateLayout(); */



    Thank you,


  2. Stefan
    Stefan avatar
    2908 posts

    Posted 16 Apr 2013 Link to this post

    Hi Ben,

    Thank you for writing.

    It seems that there is an issue with this case and the popup is not correctly sized. I have logged it in our 
    Public Issue Tracking System and we will address it accordingly. To vote for it and subscribe for status updates, please follow this link:

    For the time being, to work around the issue, you can try calling the BestFitColumns method in the DropDownOpening event:
    public partial class Form1 : Form
           public Form1()
               Random r = new Random();
               DataTable table = new DataTable();
               table.Columns.Add("ID", typeof(int));
               table.Columns.Add("Name", typeof(string));
               for (int i = 0; i < 10; i++)
                   table.Rows.Add(i, "Row with longer value " + i);
               radMultiColumnComboBox1.DropDownOpening += radMultiColumnComboBox1_DropDownOpening;
               radMultiColumnComboBox1.AutoSizeDropDownToBestFit = true;
               radMultiColumnComboBox1.DataSource = table;
           void radMultiColumnComboBox1_DropDownOpening(object sender, CancelEventArgs args)
             //  radMultiColumnComboBox1.BestFitColumns();
           private void button1_Click(object sender, EventArgs e)
               Random r = new Random();
               DataTable table = new DataTable();
               table.Columns.Add("ID", typeof(int));
               table.Columns.Add("Name", typeof(string));
               for (int i = 0; i < 10; i++)
                   table.Rows.Add(i, "Row " + i);
               radMultiColumnComboBox1.DataSource = table;

    I hope this helps. Your 
    Telerik Points have been updated for this report.

    the Telerik team
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