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Unplanned
Last Updated: 16 Jul 2025 11:31 by ADMIN
Christopher
Created on: 16 Jul 2025 10:15
Category: MultiColumnCombo
Type: Bug Report
2
MultiColumnComboBox: Rows in grid are not all displayed when first time popup open on high dpi

As the Subject states, we are running into issues where the combo is not fully displaying the first time it is opened.  Run the form on high DPI, open the popup, and scroll to the botom:

1 comment
ADMIN
Nadya | Tech Support Engineer
Posted on: 16 Jul 2025 11:31

Hello, Christopher,

Thank you for reporting this. Use the following workaround:

this.radMultiColumnComboBox1.DropDownMaxSize = new Size(this.radMultiColumnComboBox1.MultiColumnComboBoxElement.Size.Width, 0);
this.radMultiColumnComboBox1.DropDownMinSize = new Size(this.radMultiColumnComboBox1.MultiColumnComboBoxElement.Size.Width, 0);
this.radMultiColumnComboBox1.MultiColumnComboBoxElement.PopupOpened += MultiColumnComboBoxElement_PopupOpened;

private void MultiColumnComboBoxElement_PopupOpened(object sender, EventArgs e)
{
    this.radMultiColumnComboBox1.DropDownMaxSize = new Size(this.radMultiColumnComboBox1.MultiColumnComboBoxElement.Size.Width, 0);
    this.radMultiColumnComboBox1.DropDownMinSize = new Size(this.radMultiColumnComboBox1.MultiColumnComboBoxElement.Size.Width, 0);
    this.radMultiColumnComboBox1.MultiColumnComboBoxElement.EditorControl.MasterTemplate.Refresh();
    this.radMultiColumnComboBox1.MultiColumnComboBoxElement.PopupOpened -= MultiColumnComboBoxElement_PopupOpened;
}

Regards,
Nadya | Tech Support Engineer
Progress Telerik

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