Hi,
Is there a way to enable an UltraGrid cell, in a way that the user can select multiple values in that cell? Like a ListBox, or a combobox in which I can separate values by semicolon for example?
Assuming you have a relatively recent version of the control, yes, you can do this.
That way to do it is to use either an UltraCombo or an UltraComboEditor and make it multi-select using the CheckedListSettings property.
Then you attach it to a grid column via the EditorControl property of the column.