Control order of call backs

Here is my scenario:

1. Drop down#1 have list of data frames to choose and user can choose only 1 dataframe
2. Drop down#2 is dynamic and depending on the dataframe chose in dropdown#1, it’s columns get populated in this dropdown#2.
3. Based on column/s selected in dropdown#2, I have some callbacks displaying graphs for the columns selected.

Now let’s say if the user chooses another dataframe without clearing the column/s selected in dropdown#2, I am getting error from the graph displaying callbacks as the predicting columns will not be there in the newly selected datafrane.

One if the solution is when user selected a dataframe from dropdown#1, I can write a callback to first clear the values in the dropdown#2 and another Callback to populate its columns. But how can I control the order of execution of these 2 call backs pointing to same output(values in dropdown#2).

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