WebListBox.CellPicture
From Xojo Documentation
Method
WebListBox.CellPicture(RowNumber As Integer, ColumnNumber As Integer, Assigns value As WebPicture)
Supported for all project types and targets.
Supported for all project types and targets.
Add a picture to the cell based on the row and column numbers passed. Row and Column are zero-based. The top-left cell is 0,0.
Examples
Listbox1.CellPicture(3, 4) = myImage