this.radCollapsiblePanel1.EnableAnimation = false;

        Me.RadCollapsiblePanel1.HeaderText = "This is a very long header text that doesn't fit in the available space"
        Me.RadCollapsiblePanel2.HeaderText = "Sample header text"

            FilterViewNumericCategoryElement numericCategory = e.Category as FilterViewNumericCategoryElement;
            if (numericCategory != null)
            {
                numericCategory.MaxValueSpinEditor.TextBoxItem.MinSize = new Size(0, 18);
                numericCategory.MinValueSpinEditor.TextBoxItem.MinSize = new Size(0, 18);
            }
            FilterViewDateTimeCategoryElement dateCategory = e.Category as FilterViewDateTimeCategoryElement;
            if (dateCategory != null)
            {
                dateCategory.MinValueDateTimePicker.TextBoxElement.TextBoxItem.MinSize = new Size(0, 18);
                dateCategory.MaxValueDateTimePicker.TextBoxElement.TextBoxItem.MinSize = new Size(0, 18);
            }