Have a look at this example: http://jsfiddle.net/6mKKQ/1/
It uses a mixture of things:

- the Fusion Tables API for Google Chart Tools ( 
http://code.google.com/apis/fusiontables/docs/sample_code.html )
- the Google Chart tools Query (google.visualization.Query) to query a 
fusion tables data source
- once the response comes back in handleQueryResponse() , it populates a 
slider and a category picker from the received data table and puts them in a 
dashboard.

Regarding the second question, it is not possible yet to use a chart as a 
'control' (like in your example where the geomap would drive the data fed to 
chart/table), but you can mimic it using selection events:

- listen for a selection event on the geomap
- create a dataview of the input datatable retaining only the rows that 
match the selected country
- feed the dataview to the dashboard draw() method.

/R.

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