This issue is reported for R2013b version of System Identification toolbox. The development team is aware of this and they have fixed the issue for R2014b.
Restarting of the machine may help but the reliability of this resolution may vary on the system. To workaround this issue, please see the following way of programmatically assigning a dataset to the working data rectangle:
1. Note down the target dataset name (say, 'data1'); this is the name that appears on the source data icon.
2. Fetch a handle to the text object showing this name:
t1=findall(0,'type','text','string','data1')
3. Fetch the handle to the parent axes:
ax1=ancestor(t1,'axes')
4. Fetch a handle to the destination axes ("working data" box)
ax2=findall(0,'type','axes','tag','seles')
5. Execute the drag-drop callback manually:
iduidrop(ax1,ax2);
You can carry out other drag/drop operations by finding handles to the source (ax1) and destination (ax2) axes and then calling IDUIDROP.
