I want pre approval pop up when I press any command.

Hi Asadullah, We need some more context to help you here.

Is it Industrial Graphics based products you are using? InTouch, OMI, etc?

If so, here is an example of how I have solved it in similar scenarios in Industrial Graphics, it requires the script function library System.Windows.Forms.dll to be imported in your galaxy/application though. 
If you do not know from where, please use the following location
(C:\Program Files (x86)\ArchestrA\Framework\Bin\Microsoft_Corporation__System.Windows.Forms.dll)

Here is the example code to use in graphics (animation script).

dim DialogResult as System.Windows.Forms.DialogResult;
'DialogResult = System.Windows.Forms.MessageBox.Show("Are you sure?","Prompt for reply...",System.Windows.Forms.MessageBoxButtons.YesNo);
DialogResult = System.Windows.Forms.MessageBox.Show("Are you sure?","Prompt for reply...",System.Windows.Forms.MessageBoxButtons.YesNoCancel);
if DialogResult == System.Windows.Forms.DialogResult.Yes then
	'User selected Yes
	LogMessage("Yes");
elseif DialogResult == System.Windows.Forms.DialogResult.No then
	'User clicked No
	LogMessage("No");
else
	'User clicked cancel or closed dialog box (if possible).
	LogMessage("Cancel");
endif;

Example with Yes, No and Cancel

Example with Yes, No only.

Hi Asadullah, We need some more context to help you here.

Is it Industrial Graphics based products you are using? InTouch, OMI, etc?

If so, here is an example of how I have solved it in similar scenarios in Industrial Graphics, it requires the script function library System.Windows.Forms.dll to be imported in your galaxy/application though. 
If you do not know from where, please use the following location
(C:\Program Files (x86)\ArchestrA\Framework\Bin\Microsoft_Corporation__System.Windows.Forms.dll)

Here is the example code to use in graphics (animation script).

dim DialogResult as System.Windows.Forms.DialogResult;
'DialogResult = System.Windows.Forms.MessageBox.Show("Are you sure?","Prompt for reply...",System.Windows.Forms.MessageBoxButtons.YesNo);
DialogResult = System.Windows.Forms.MessageBox.Show("Are you sure?","Prompt for reply...",System.Windows.Forms.MessageBoxButtons.YesNoCancel);
if DialogResult == System.Windows.Forms.DialogResult.Yes then
	'User selected Yes
	LogMessage("Yes");
elseif DialogResult == System.Windows.Forms.DialogResult.No then
	'User clicked No
	LogMessage("No");
else
	'User clicked cancel or closed dialog box (if possible).
	LogMessage("Cancel");
endif;

Example with Yes, No and Cancel

Example with Yes, No only.

Actually, I am using Citect SCADA and  i just want popup for approval if I press any command it will just ask Yes or No in the Pop up

Ok, let see if anyone else can assist you then, or please make sure to post your question in the AVEVA︎ Plant SCADA section to get the appropriate attention.

Asadullah . Do you still have issue?