A combo box on a form can pick up the list contents from its RowSource property. This can be the name of a worksheet range – such as “products” (not ever a literal address, please).
However, this is tricky if the size of the list changes (if the list grows, specifically). With a standard defined Name, you need to keep on redefining the Name. Alternatively, you can use the OFFSET-function trick for dynamic ranges (but that is obscure and depends on things like the number of non-data cells in the column).
In 2007 we have the Structured Reference naming into Tables, such as “ProductTable[Product]”, which returns us the data contents of the product column. On a recent course, I was asked if we could use this as a Combo box RowSource property. The good news is that we can:
Any additions to the Table are picked up when the form reopens:
You could get this to work for a multi-column list (e.g. id + name, with the id as BoundColumn). For a 2-column table, you can specify the whole data area: “ProductTable[#data]”. It doesn’t matter if the #data area has more columns than the list needs: the leftmost ones are used.
Initially, I thought I’d try this with an ActiveX combo box dropped directly on to the worksheet. However, such on-sheet controls are actually OLEObjects. Rather than a RowSource property, they have a ListFillRange. An OLEObject could be things other than a List/Combo box, in which case this property would be inapplicable. (Similarly, RowSource is actually defined on the Control class).
That’s okay, but unfortunately, OLEObject.ListFillRange does not understand structured references into tables: it needs either a regular Defined Name or (don’t) a literal address. This seems like an oversight: the OLEObject‘s Parent is the Worksheet, which holds the Table as a ListObject – so it should be possible to resolve the name.
Nevertheless, it works fine for the Form combo boxes, and I’ll try to use this technique in the future.