Why can't I get CalendarBox values from inside an IfBox in a modal window?

[#1]

I'm using JMP 19. I have a modal window with an interactive user interface. Inside that interface the user chooses some dates and I want to use those dates when they close the window. 

I can get the value of a RadioBox or a TextEditBox, so why does the CalendarBox show as Empty() when I try to get values from it?

QueryWindow = NewWindow("Query.jsl",
		<<Modal,
		<<Return Result,
		PanelBox("Test Data Query Builder",
			PanelBox("Database Info", TextBox("Connection Info", <<SetFontSize(6))),
			PanelBox("Date Range", 
						rb_DateOption = RadioBox({"From-To","From-to-Present","Wildcard"},<<SetFunction(
												Function({this},
													Sel1 = rb_DateOption << GetSelected();
													if_From << Set(Sel1 == "From-To"|Sel1 == "From-to-Present");
													if_To << Set(Sel1 == "From-To");
													if_cb << Set(Sel1 == "From-To"|Sel1 == "From-to-Present");
													))),
			LineupBox(NCol(2), if_From = IfBox(1,qw_From = CalendarBox(<<Date(Today()-In Days(180)), 
																	   <<Min Date(Parse Date("1/1/2000")), 
																	   <<Max Date(Today()-In Hours(12)),
																	   <<ShowTime(0)
																	   )
											   ), 
							   if_To = IfBox(1,qw_To = CalendarBox(<<Date(Today()), 
																   <<Min Date(qw_From), 
																   <<Max Date(Today()),
																   <<ShowTime(0)
																   )
											), 
							   if_cb = IfBox(1,TextBox("Dates are absolute in each time zone unless \!"To Present\!" is selected.",
										<<SetFontSize(8))),							   	
							   ),

			),
			PanelBox("Query Parameters",
				LineupBox(NCol(2), TextBox("Category        "), lb_Category = ListBox({"1","2"}, <<SetFontSize(8))),
				LineupBox(NCol(2), TextBox("Part Numbers"), tb_PartNums = TextEditBox("%", <<SetNLines(3), <<SetWidth(200))),
			),		
		)
	);
	
show(QueryWindow["tb_PartNums"]);
show(QueryWindow["rb_DateOption"]);
show(QueryWindow["qw_From"]);

[#2]

I have not studied this in a while, but it still seems to work Select Date Range with Calendar Boxes 

[#3 · Accepted solution]

<< Return Result might not work with << Get Date which calendar box uses. Usually I don't rely just on << Return Result and I always add OK/Cancel buttons to Modal windows and when you do this, you can add << Get Date to the OK button for example

QueryWindow = New Window("Query.jsl",
	<<Modal,
	<<Return Result,
	Panel Box("Test Data Query Builder",
		Panel Box("Database Info", Text Box("Connection Info", <<SetFontSize(6))),
		Panel Box("Date Range",
			rb_DateOption = Radio Box(
				{"From-To", "From-to-Present", "Wildcard"},
				<<SetFunction(
					Function({this},
						Sel1 = rb_DateOption << GetSelected();
						if_From << Set(Sel1 == "From-To" | Sel1 == "From-to-Present");
						if_To << Set(Sel1 == "From-To");
						if_cb << Set(Sel1 == "From-To" | Sel1 == "From-to-Present");
					)
				)
			),
			Lineup Box(N Col(2),
				if_From = If Box(
					1,
					qw_From = Calendar Box(
						<<Date(Today() - In Days(180)),
						<<Min Date(Parse Date("1/1/2000")),
						<<Max Date(Today() - In Hours(12)),
						<<ShowTime(0)
					)
				),
				if_To = If Box(1, qw_To = Calendar Box(<<Date(Today()), <<Min Date(qw_From), <<Max Date(Today()), <<ShowTime(0))),
				if_cb = If Box(1, Text Box("Dates are absolute in each time zone unless \!"To Present\!" is selected.", <<SetFontSize(8))),

			), 

		),
		Panel Box("Query Parameters",
			Lineup Box(N Col(2), Text Box("Category        "), lb_Category = List Box({"1", "2"}, <<SetFontSize(8))),
			Lineup Box(N Col(2), Text Box("Part Numbers"), tb_PartNums = Text Edit Box("%", <<SetNLines(3), <<SetWidth(200))),

		),
		Panel Box("Actions",
			Lineup Box(N Col(2),
				Button Box("OK",
					to = qw_to << get date;
					from = qw_from << get date;
				),
				Button Box("Cancel")
			)
		)
	)
);
	
Show(QueryWindow["tb_PartNums"]);
Show(QueryWindow["rb_DateOption"]);
Show(QueryWindow["qw_From"]);
show(to, from);

[#4]

I really appreciate the answer. 

I was also able to do the same with OnValidate, though I would still like to know why the QueryWindow[] comes up as Empty(). I think that would help my understanding of what's preventing it from working both ways. 

[#5]

Did you verify that the issue is ifbox + calendar box?

Names Default To Here(1);

nw = New Window("Query.jsl",
	<<Modal,
	<<Return Result,
	cb1 = Calendar Box()
);

My guess is that << Return Result which you can use to get the results from Modal Window inputs doesn't just work with Calendar Box() so it will return Empty().

[#6]

Oh, it didn't work either way, IfBox(CalendarBox()) or CalendarBox(). I had to use the buttons or OnValidate.