I am taking a wild guess here. Would it work any better if you clicked on the object before running this code? Perhaps it would cause the dropdown to appear and then the GetItem would work.
I would unchecked or deselect all items of SfwList.
I try with this code:
listItemCount = SwfWindow("Task List").SwfComboBox("filter_checkedComboBox").Object.Items.Count
For iterator = 0 To listItemCount - 1
itemCurrent = SwfWindow("Task List").SwfWindow("ccbParent").SwfList("cclb").GetItem(iterator)
But this code generates one error and if combobox is not open GetItem(iterator) not works.
How can I resolve it?
I've seen this happen with custom controls. (controls extended by developers to provide additional functionality) This is pretty commonly used in embedded controls, like a search box inside a datagrid or a combining controls like a text box and a drop down with an embedded checkbox in your case.
Generally I just ask the developer for the MXML file for that components and from there I wire up some automation hooks to easily access it. Another harder way of approaching this is to write a custom plugin for your automation tool for working with that custom component. This approach tends to be more annoying as you're hooking pretty deep into the components while working in the dark.