Component-based programming, as a technology increasing development speed and decreasing cost of the final product, promises a noticeable improvement in a process of development of large enterprise applications. Even though component-based programming is a promising technology it still has not reached its maturity. The main problem addressed in this paper are compatibility checks of components in terms of functional and extra-functional properties and their insufficient tool support. This paper summarizes a mechanism of component compatibility checks and introduces a tool whose aim is to fill this gap mainly with respect to the phase of testing the assembly of components. The introduced mechanism and the tool allow to check component bindings before deployment into the target environment. It displays a component graph, details of components and highlights incompatibility problems. Hence, the tool validates the presented mechanism and provides useful support for developers when deciding which component to use. * This work was supported by the Grant Agency of the Czech Republic under grant number 201/08/0266 "Methods and models for consistency verification of advanced component-based applications".