I have a web application that we built originally with Aspose.Grid v18.104.22.168. The grid is programatically created by creating BindColumns, setting their properties, adding a Validation of type "ValidationType.DropDownList" and then inserting the BindColumn into the BindColumns collection.
The problem doesn't seem to be related with how the Validation object's validation list members are added. In one column, I use the Validation.LoadValueList() method to load the Validation object's validation list from a DataView object. In another column I use the Validation.ValueList.Add() method to add static list members. If I upgrade the componet to any version high than v22.214.171.124, the drop-down list boxes can be activated, but they do not have any of the lookup values in them when I drop them down. Clicking in the blank list area does not collapse the list box, so I do not think that this is an issue of white text on a white background.
Furthermore when I click off of the drop-down list box, the cell displays the value "undefined".
If I roll back to the Aspose.Grid v126.96.36.199 DLL, my values appear as expected and the chosen lookup value is saved when I select a list item.