How to set the DynamicSelect expression in Modelica models

I plan to show a variable's quantity in a text string, so I checked the usage of DynamicSelect expression in Modelica Specification, as shown below:

Here is an example I make, it only contains one Modelica.Blocks.Sources.Sine component and a text label, but I am not sure why the text doesn't change during the simulation. It seems like the DynamicSelect expression doesn't work at all.
My question is:
How should I set the DynamicSelect expression to make it work?

model fsdaf

  Modelica.Blocks.Sources.Sine sine(amplitude=100, freqHz=1)
    annotation (Placement(transformation(extent={{-124,-10},{-104,10}})));
equation 

  annotation (Diagram(graphics={
          Text(
          extent={{-22,60},{98,10}},
          lineColor={28,108,200},
          fillColor={238,46,47},
          fillPattern=FillPattern.None,
          textString=DynamicSelect(10,string(sine.y)))}),
          uses(Modelica(version="3.2.3")));
end fsdaf;

Solution

Please use String() for conversion of numeric values to string.
Browse the Modelica Standard Library which uses DynamicSelect in various places.
Here is an improved example for Modelica Standard Library version 4 with slowed down simulation:

model TestDynamicSelect
  Modelica.Blocks.Sources.Sine sine(amplitude=100, f=1) annotation(Placement(transformation(extent={{-80,40},{-60,60}})));
  Modelica_DeviceDrivers.Blocks.OperatingSystem.RealtimeSynchronize realtimeSynchronize annotation(Placement(transformation(extent={{-80,0},{-60,20}})));
  annotation(experiment(StopTime=10), Diagram(graphics={
   Text(
     extent={{-22,60},{98,10}},
     lineColor={28,108,200},
     fillColor={238,46,47},
     fillPattern=FillPattern.None,
     textString=DynamicSelect(10,String(sine.y)))}),
   uses(Modelica(version="4.0.0"), Modelica_DeviceDrivers(version="2.0.0")));
end TestDynamicSelect;