Object not found for saved object.

I have being struggling with this error frequently. I record the script and add object check point. When I sopt and execute the same script again TC is not able to find the object ???????

Is there a problem with TC on WPF applications ???????????

Object name: ["WPFObject"]("DataGridColumnHeader", "app4_Updated Global Part_2013_Software Level _revRevision", 8) Parent object name: Sys["Process"]("CalBuilder")["WPFObject"]("HwndSource: mainWindow")["WPFObject"]("mainWindow")["WPFObject"]("Grid", "", 1)["WPFObject"]("Grid", "", 1)["WPFObject"]("MainGrid")["WPFObject"]("Grid", "", 1)["WPFObject"]("calFileDataGrid")
The object was not found.

Object name: ["WPFObject"]("DataGridColumnHeader", "app3_Updated Global Part_2013_Software Level _revRevision", 7) Parent object name: Sys["Process"]("CalBuilder")["WPFObject"]("HwndSource: mainWindow")["WPFObject"]("mainWindow")["WPFObject"]("Grid", "", 1)["WPFObject"]("Grid", "", 1)["WPFObject"]("MainGrid")["WPFObject"]("Grid", "", 1)["WPFObject"]("calFileDataGrid")
The object was not found.

Object name: ["WPFObject"]("DataGridColumnHeader", "app2_Updated Global Part_2013_Software Level _revRevision", 6) Parent object name: Sys["Process"]("CalBuilder")["WPFObject"]("HwndSource: mainWindow")["WPFObject"]("mainWindow")["WPFObject"]("Grid", "", 1)["WPFObject"]("Grid", "", 1)["WPFObject"]("MainGrid")["WPFObject"]("Grid", "", 1)["WPFObject"]("calFileDataGrid")
The object was not found.

Object name: ["WPFObject"]("DataGridColumnHeader", "app1_Updated Global Part_2013_Software Level _revRevision", 5) Parent object name: Sys["Process"]("CalBuilder")["WPFObject"]("HwndSource: mainWindow")["WPFObject"]("mainWindow")["WPFObject"]("Grid", "", 1)["WPFObject"]("Grid", "", 1)["WPFObject"]("MainGrid")["WPFObject"]("Grid", "", 1)["WPFObject"]("calFileDataGrid")
The object was not found.

Object name: ["WPFObject"]("DataGridColumnHeader", "app5_Updated Global Part_2013_Software Level _revRevision", 4) Parent object name: Sys["Process"]("CalBuilder")["WPFObject"]("HwndSource: mainWindow")["WPFObject"]("mainWindow")["WPFObject"]("Grid", "", 1)["WPFObject"]("Grid", "", 1)["WPFObject"]("MainGrid")["WPFObject"]("Grid", "", 1)["WPFObject"]("calFileDataGrid")
The object was not found.