The Dvelop Combo can be loaded dynamically, from a value defined in another DvelopCombo
For example, if we have Countries like "Canada", "México" and "Tailandia in a DvelopCombo, and we want to show only the Cities of each Country in another DvelopCombo, we can define two transactions as follow:
![DefaultValuToDvelopCombo01.png](/com.wiki.apgetwikiimage?3295,3)
In the attribute CountryId we need to define the DvelopCombo and the property "Load Data Dynamically" in "true" as follow:
![DefaultValuToDvelopCombo02.png](/com.wiki.apgetwikiimage?3296,2)
The attribute CityId must be defined with a condition when the attribute CountryId is the attribute to listen as follow:
CountryId = &Cond_CountryId
![DefaultValuToDvelopCombo03.png](/com.wiki.apgetwikiimage?3299,2)
The result is this:
![DefaultValuToDvelopCombo04.png](/com.wiki.apgetwikiimage?3301,3)
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