Here is my code for dropdown and search:
<input type="dropdown" token="Farm">
<label>Select Farm</label>
<populatingSearch fieldForValue="GRID_FARM_NAME" fieldForLabel="FARM_NAME">
<![CDATA[ | inputlookup farm_consumer_grid ]]>
</populatingSearch>
</input>
<row>
<chart>
<title>Consumer Demand vs Allocation</title>
<searchString>sourcetype="Grid-Symphony:consumer_demand" [|inputlookup append=t farm_consumer_grid|search GRID_FARM_NAME=$Farm$ |return CLUSTER_NAME,CONSUMER_NAME] |timechart span=5min sum(USED) as Allocation, sum(MAX_REQUESTED) as Demand</searchString>
<option name="charting.chart">line</option>
<option name="charting.legend.placement">bottom</option>
<option name="count">10</option>
<option name="displayRowNumbers">true</option>
</chart>
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