Switch Value not changing in matlab app designer function

Hi i would like to have suggestions about how can i monitor the value of a switch in Matlab app desinger..i have a while loop to count the frames of video and want to break the loop when the switch value is paused. here is my code. the problem is that the switch value is not changing as the loop runs but it should.

function Camera_number(app,Cam_no)

Mode=app.Switch.Value;

if(strcmp(Mode,'Play'))

Option=0;

else

Option=1

end

switch Option

case 0

if strcmp(Cam_no,'Cam1')

temp=zeros(1,5);

j=1;

Frnu=app.FamraNumer;

while (Frnu<99)

sw=app.Switch.Value

if(strcmp(sw,'pause'))

break;

else

image(app.UIAxes2,app.Frames(:,:,:,Frnu));

k=j;

while j<k+4

temp=[temp,app.Data(j,:)];

j=j+1;

plot(app.UIAxes,temp,'ko')

end

Frnu=Frnu+1

pause(.1);

end

plot(app.UIAxes,temp)

end

end

end

end

end