Add a RadCollapsiblePanel and put a RadFilterView in it. When the panel is collapsed and then expanded, the editors' text in RadFilterView is clipped.
Workaround:
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);
}