[Problem] Updating Numeric Controls on a Tab Problem

Question

Using LabWindows CVI 8.0.1
I have a UIR with a button on it and a tab control.  On the tab control there are 23 numeric controls.
When the button is pressed the code reads a file and populates an array.  It then populates 23 controls on the tab.
I have a constant array defined for the controls.  The button call back gets the panel handle and then loops through each control and populates it from the array of values.
The problem I am seeing is if I click the button 22 of the controls update, the first one does not.  If I save the data (another button) it saves the values which are loaded (i.e. it knows the first control contains a value even though it is displaying 0.000). 
If I click the button twice, then all 23 controls update.
I added ProcessDrawEvents and ProcessSystemEvents but it made no difference.  However if, in my code I modified the callback to call the function that populates the tab controls twice it populates all 23 controls correctly first time. 
Is this a known issue, or has anyone seen this before?
Should mention that the code is compiled as a DLL and is called via TestStand 3.5.  It makes use of #include "tsutil.h" library.  There is also a ActiveX control on the UIR (not on the tab) which is a date picker.
Christopher Povey
Senior Test Systems Engineer for BAE Systems.

Answer 1

Global:
#define NumberOfCrosses 23
const int CrossCtrlAzimuthHandles [NumberOfCrosses]   = { CROSSPOSN_X_CROSS_1,  CROSSPOSN_X_CROSS_2,  CROSSPOSN_X_CROSS_3,  CROSSPOSN_X_CROSS_4,  CROSSPOSN_X_CROSS_5, 
                             CROSSPOSN_X_CROSS_6,  CROSSPOSN_X_CROSS_7,  CROSSPOSN_X_CROSS_8,  CROSSPOSN_X_CROSS_9,  CROSSPOSN_X_CROSS_10,
                             CROSSPOSN_X_CROSS_11, CROSSPOSN_X_CROSS_12, CROSSPOSN_X_CROSS_13, CROSSPOSN_X_CROSS_14, CROSSPOSN_X_CROSS_15,
                             CROSSPOSN_X_CROSS_16, CROSSPOSN_X_CROSS_17, CROSSPOSN_X_CROSS_18, CROSSPOSN_X_CROSS_19, CROSSPOSN_X_CROSS_20,
                             CROSSPOSN_X_CROSS_21, CROSSPOSN_X_CROSS_22, CROSSPOSN_X_CROSS_23 };
const int CrossCtrlElevationHandles [NumberOfCrosses] = { CROSSPOSN_Y_CROSS_1,  CROSSPOSN_Y_CROSS_2,  CROSSPOSN_Y_CROSS_3,  CROSSPOSN_Y_CROSS_4,  CROSSPOSN_Y_CROSS_5, 
                             CROSSPOSN_Y_CROSS_6,  CROSSPOSN_Y_CROSS_7,  CROSSPOSN_Y_CROSS_8,  CROSSPOSN_Y_CROSS_9,  CROSSPOSN_Y_CROSS_10,
                             CROSSPOSN_Y_CROSS_11, CROSSPOSN_Y_CROSS_12, CROSSPOSN_Y_CROSS_13, CROSSPOSN_Y_CROSS_14, CROSSPOSN_Y_CROSS_15,
                             CROSSPOSN_Y_CROSS_16, CROSSPOSN_Y_CROSS_17, CROSSPOSN_Y_CROSS_18, CROSSPOSN_Y_CROSS_19, CROSSPOSN_Y_CROSS_20,
                             CROSSPOSN_Y_CROSS_21, CROSSPOSN_Y_CROSS_22, CROSSPOSN_Y_CROSS_23  };
const int CrossCtrlDistortionTolerancesHandles [NumberOfCrosses] = { DISTTOL_TOL_CROSS_1,  DISTTOL_TOL_CROSS_2,  DISTTOL_TOL_CROSS_3,  DISTTOL_TOL_CROSS_4,  DISTTOL_TOL_CROSS_5,
                                   DISTTOL_TOL_CROSS_6,  DISTTOL_TOL_CROSS_7,  DISTTOL_TOL_CROSS_8,  DISTTOL_TOL_CROSS_9,  DISTTOL_TOL_CROSS_10,
                                   DISTTOL_TOL_CROSS_11, DISTTOL_TOL_CROSS_12, DISTTOL_TOL_CROSS_13, DISTTOL_TOL_CROSS_14, DISTTOL_TOL_CROSS_15,
                                   DISTTOL_TOL_CROSS_16, DISTTOL_TOL_CROSS_17, DISTTOL_TOL_CROSS_18, DISTTOL_TOL_CROSS_19, DISTTOL_TOL_CROSS_20,
                                   DISTTOL_TOL_CROSS_21, DISTTOL_TOL_CROSS_22, DISTTOL_TOL_CROSS_23 };
Function:
 // Get the panel handles.
 tsErrChk (GetPanelHandleFromTabPage (panelHandle, MAIN_PANEL_TAB, 0, &calibrationTabHandle));
 tsErrChk (GetPanelHandleFromTabPage (panelHandle, MAIN_PANEL_TAB, 1, &tolerancesTabHandle));
 // Get the cross positions.
 for (loop = 0; loop < NumberOfCrosses && error >= 0; loop++)
  tsErrChk (SetCtrlVal (calibrationTabHandle, CrossCtrlAzimuthHandles   [loop],            calibrationValues.crossAzimuthPosition      [loop]));
  tsErrChk (SetCtrlVal (calibrationTabHandle, CrossCtrlElevationHandles [loop],            calibrationValues.crossElevationPosition    [loop]));
  tsErrChk (SetCtrlVal (tolerancesTabHandle,  CrossCtrlDistortionTolerancesHandles [loop], calibrationValues.crossDistortionTolerances [loop]));
No errors are returned to TestStand.
Christopher Povey
Senior Test Systems Engineer for BAE Systems.